Nipah Virus (NiV), a member of the Paramyxoviridae family, is one of the most infectious zoonotic viruses in Southeast Asia. First recorded in Malaysia in 1998, the NiV outbreak infected hundreds of people, with an al...Nipah Virus (NiV), a member of the Paramyxoviridae family, is one of the most infectious zoonotic viruses in Southeast Asia. First recorded in Malaysia in 1998, the NiV outbreak infected hundreds of people, with an almost 50% death rate. The virus is transmitted through direct contact with contaminated subjects and infecting the human respiratory system. Ephrin B2 and B3, the surface glycoproteins on the host cell, have been the primary and the most effective route for viral entrance. Binding with viral surface G protein, the F protein triggers, enabling viral-host fusion. Until now, NiV vaccines are not yet available in the public market, however, preventions such as avoiding direct contact and masking are advised.展开更多
This review represents an updated scenario on the transmission cycle,epidemiology,clinical features and pathogenicity,diagnosis and treatment,and prevention and control measures of a cestode parasite Echincoccus granu...This review represents an updated scenario on the transmission cycle,epidemiology,clinical features and pathogenicity,diagnosis and treatment,and prevention and control measures of a cestode parasite Echincoccus granulosus(E.granulosus) infection causing cystic echinococcosis (CE) in humans.Human CE is a serious life-threatening neglected zoonotic disease that occurs in both developing and developed countries,and is recognized as a major public health problem. The life cycle of E.granulosus involves a definitive host(dogs and other canids) for the adult E.granulosus that resides in the intestine,and an intermediate host(sheep and other herbivores) for the tissue-invading metacestode(larval) stage.Humans are only incidentally infected;since the completion of the life cycle of E.granulosus depends on carnivores feeding on herbivores bearing hydatid cysts with viable protoscoleces,humans represent usually the dead end for the parasite.On ingestion of E.granulosus eggs,hydatid cysts are formed mostly in liver and lungs, and occasionally in other organs of human body,which are considered as uncommon sites of localization of hydatid cysts.The diagnosis of extrahepatic echinococcal disease is more accurate today because of the availability of new imaging techniques,and the current treatments include surgery and percutaneous drainage,and chemotherapy(albendazole and mebendazole).But.the wild animals that involve in sylvatic cycle may overlap and interact with the domestic sheepdog cycle,and thus complicating the control efforts.The updated facts and phenomena regarding human and animal CE presented herein are due to the web search of SCI and non-SCI journals.展开更多
The ongoing pandemic of coronavirus disease 2019 (COVID-19), caused by infection with human coronavirus 2019 (HCoV-19/SARS-CoV-2/2019-nCoV), is a global threat to the human population. Here, we briefly summarize the a...The ongoing pandemic of coronavirus disease 2019 (COVID-19), caused by infection with human coronavirus 2019 (HCoV-19/SARS-CoV-2/2019-nCoV), is a global threat to the human population. Here, we briefly summarize the available data for the zoonotic origins of HCoV-19, with reference to the other two epidemics of highly virulent coronaviruses, SARSCoV and MERS-CoV, which cause severe pneumonia in humans. We propose to intensify future efforts for tracing the origins of HCoV-19, which is a very important scientific question for the control and prevention of the pandemic.展开更多
Objective: To predict the trend of cutaneous leishmaniasis and assess the relationship between the disease trend and weather variables in south of Fars province using Seasonal Autoregressive Integrated Moving Average(...Objective: To predict the trend of cutaneous leishmaniasis and assess the relationship between the disease trend and weather variables in south of Fars province using Seasonal Autoregressive Integrated Moving Average(SARIMA) model,Methods: The trend of cutaneous leishmaniasis was predicted using Mini tab software and SARIMA model,Besides,information about the disease and weather conditions was collected monthly based on time series design during January 2010 to March 2016,Moreover,various SARIMA models were assessed and the best one was selected,Then,the model's fitness was evaluated based on normality of the residuals' distribution,correspondence between the fitted and real amounts,and calculation of Akaike Information Criteria(AIC) and Bayesian Information Criteria(BIC),Results: The study results indicated that SARIMA model(4,1,4)(0,1,0)(12) in general and SARIMA model(4,1,4)(0,1,1)(12) in below and above 15 years age groups could appropriately predict the disease trend in the study area,Moreover,temperature with a three-month delay(lag3) increased the disease trend,rainfall with a four-month delay(lag4) decreased the disease trend,and rainfall with a nine-month delay(lag9) increased the disease trend,Conclusions: Based on the results,leishmaniasis follows a descending trend in the study area in case drought condition continues,SARIMA models can suitably measure the disease trend,and the disease follows a seasonal trend.展开更多
Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),a novel coronavirus(CoV),has recently emerged as a significant pathogen for humans and the cause for the recent outbreak of the 2019 novel coronavirus diseas...Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),a novel coronavirus(CoV),has recently emerged as a significant pathogen for humans and the cause for the recent outbreak of the 2019 novel coronavirus disease(COVID-19)throughout the globe.For developing any preventive measure,an understanding of the zoonotic pattern for this virus is a necessity.We should have a clear knowledge of its reservoir host,its distribution pattern and spreading routes.Information about zoonotic reservoirs and its transmission among them can help to understand the COVID-19 outbreaks.In this article,we discuss about the bats as the zoonotic reservoir of several CoV strains,co-existence of bats and CoV/viruses,the sequence similarity of SARS-CoV-2 with bat SARS-like CoV,the probable source of the origin of SARS-CoV-2 strain and COVID-19 outbreak,intermediate host of CoVs and SARS-CoV-2,human to human transmission and the possibility to maintain the zoonotic barriers.Our knowledge about the zoonotic reservoir of SARS-CoV-2 and its transmission ability may help develop the preventive measures and control for the future outbreak of CoV.展开更多
Raw poultry and poultry products are a significant source of zoonotic bacterial pathogen transmission;thus the sensitive detection of major zoonotic pathogens (Salmonella spp., Campylobacter jejuni, and Listeria monoc...Raw poultry and poultry products are a significant source of zoonotic bacterial pathogen transmission;thus the sensitive detection of major zoonotic pathogens (Salmonella spp., Campylobacter jejuni, and Listeria monocytogenes) is a vital food safety issue. Recently, third generation PCR technology, known as droplet digital PCR (ddPCR) has been developed to be more accurate and sensitive to detect genetic targets than current quantification methods, but this technology has not been tested within an industrial setting. There is an on-going study within our laboratory is investigating the effects of sampling times and sampling methods on the cultural and molecular (via qPCR) quantification of dominant zoonotic pathogens within a poultry processing facility. This presents a unique opportunity to compare the quantification resulted from this emerging, third generation technology to traditional quantification methods currently employed by the poultry industry. The results show that ddPCR detected pathogen-specific genes from more pathogen:sampling time combinations than either the qPCR or culturing methods from the final scalder and chiller tanks at three stages of processing (Start, Mid, and End). In fact, both ddPCR and qPCR substantially outperformed culture methods commonly used in poultry processing food safety-related studies, with Salmonella recovered only from the Mid and End sampling times from the scalder tank. While neither C. jejuni nor L. monocytogenes were recovered culturally, ddPCR was able to detect their respective genes commonly throughout the processing day in both the scalder and chiller water samples. Additionally, the use of unfiltered processing water provided significantly greater detection of bacterial and pathogen-specific gene abundances than did an analysis of larger volumes of filtered water. Considering the ddPCR-derived concentrations of the bacterial pathogens were consistent with what was previously found culturally in commercial poultry processing operations, ddPCR represented a significant advancement in poultry processing zoonotic pathogen quantification.展开更多
Objective:To estimate the prevalence of hydatidosis,cysticercosis,tuberculosis,leptospirosis,brucellosis and toxoplasmosis in slaughtered bovine stock(aged≥3 years)at Tanga city abattoir,Tanzania.Methods:Prevalence e...Objective:To estimate the prevalence of hydatidosis,cysticercosis,tuberculosis,leptospirosis,brucellosis and toxoplasmosis in slaughtered bovine stock(aged≥3 years)at Tanga city abattoir,Tanzania.Methods:Prevalence estimation of the five zoonotic diseases was undertaken through an active abattoir and sero-survey was carried out in Tanga city,during the period of January 2002and March 2004.Serum samples collected from a sub-sample(n=51)of the slaughter stock were serologically screened for antibodies against brucellosis,leptospirosis and toxoplasmosis using Rose Bengal plate test,microscopic agglutination test(for 5 serovars of Leptospira interrogans)and Eiken latex agglutination test,respectively.The same animals were tested for tuberculosis using the single intradermal tuberculin test.Results:Post mortem examination of 12 444 slaughter cattle(10 790 short horn zebu and 1 654 graded)over a period of twenty two months,showed a prevalence of 1.56%(194)for hydatidosis,1.49%(185)for cysticercosis and 0.32%(40)for tuberculosis.In all three zoonoses,a statistically significant difference in infection rates was noted between the short horn zebu and graded breeds(P<0.05).The overall seroprevalences of animals with brucellosis,toxoplasmosis and leptospirosis antibodies were found to be 12%,12%and 51%,respectively.The most common leptospiral antibodies detected were those against antigens of serovars Leptospira hardjo(29%),Leptospira tarassovi(18%),Leptospira bataviae(4%)and Leptospira pomona(0%).With regard to tuberculosis,10%(n=5)of the animals tested were classified as non-specific reactors or inconclusive.Conclusions:The study findings suggest that brucellosis,toxoplasmosis and leptospirosis are prevalent in Tanga and provide definitive evidence of slaughtered stock exposure to these zoonotic agents with concurrent public health consequences.展开更多
Ohjective:To assess molecular characterization,distribution,seasonal activities of sandfly species and Leishmania parasites infecting them for this zoonotic cutaneous leishmaniasis focus.Methods:The collections were c...Ohjective:To assess molecular characterization,distribution,seasonal activities of sandfly species and Leishmania parasites infecting them for this zoonotic cutaneous leishmaniasis focus.Methods:The collections were carried out in 2009-2011 using CDC traps,Sticky Papers and manual aspirator in and around the villages in Abarkouh district.Individual sandflies were characterized by PCR amplification and sequencing of fragments of their mitochondrial cytochrome b gene.Leishmania parasite infections within sandflies were performed by targeting Cyt b,ITS-rDNA,k-DNA and microsatellite genes.Results:The PCR assays detected only Leishmania major(L.major).All infections(30)were found in the abundant and widespread vector Phlebolomus papalasi(P.papatasi).Small numbers of other sandfly species were also screened for infections,but none was found.Sergentomyia sinloni and P.papalasi were the predominant members in all locations of this district and in all habitats throughout the trapping season.Only five other sandfly species were found,namely Phlebolomus ansari,Phlebotomus caucasicus,Phlebotomus sergenti,Sergentomyia dentata and Sergentomyia merviney.Conclusions:In the current survey,the only infections detected are of L.major in females of P.papatasi(30 out of190).The rates of infection of P.papalasi by L.major are not significantly different in compare with other locations in Iran with no diversity of parasite strains.Zoonotic cutaneous leishmaniasis may have emerged only recently in Abarkouh district,and the reason may well be the instability of the transmission cycles there.展开更多
Objective:To investigate the zoonotic visceral leishmaniasis(ZVL) by identification of the most probable reservoir hosts using parasite isolation and analysis of a possible transmission dynamics of the disease in extr...Objective:To investigate the zoonotic visceral leishmaniasis(ZVL) by identification of the most probable reservoir hosts using parasite isolation and analysis of a possible transmission dynamics of the disease in extra-domestic agricultural fields and rural villages.Methods:Rodents were collected from selected study sites in kala-azar endemic areas based on information for localities of kala-azar cases for screening of Leshmania infections using parasitological,serological and polymerase chain reaction(PCR) from March.2013 to January,2014.Ketamine(Clorketam Veterinary) was used to anaesthesize the rodents according the prescribed dosage(average 2 mg/kg for intra-venous route).The blood obtained using sterile needle was dropped into sterile filter paper and allowed to air dry before sealing in plastic bags.The tissues from liver,spleen and skin were macerated in Locke's solution before transferring them into NNN medium.Blood and touch smears of liver,spleen,skin and bone marrow were prepared for fixing using methanol and staining by Giemsa stain for microscopy.These tissues were also ascd for DNA extractions and PCR amplification of Leishmania infection.Results:A total of 335 rodents(13 species) were analyzed by sampling internal organs.The infection rate by PCR was 11.1%(6/54) for Arvicanthis nilothicas compared to 17.6%(3/17) and 12.5%(2/16) for Acomys cahirinus and Tarera(C) robustus respectively.Almost all the infections were found from bone marrow samples(8/48 or 16.7%) compared with 1/91(1.1%) liver,2/87(2.2%) spleen and 0/87(0%) skin.In all study sites with past human VL cases,rodents and proved vectors shared similar habitats.Conclusions:Leishmania donovani might circulate among different species of rodents in kala-azar endemic lowlands and valleys of Ethiopia by Phlebotamus orientalis and Phlebotomus martini.Detailed studies to substantiate the preliminary data on the possible role of these rodents arc urgently needed.展开更多
Objective:To carry out the genetic characterization and evolutionary analysis of three avian orthoavulavirus 1(AOAV-1)isolates from poultry workers with respiratory symptoms.Methods:Using Illumina Mi Seq,whole-genome ...Objective:To carry out the genetic characterization and evolutionary analysis of three avian orthoavulavirus 1(AOAV-1)isolates from poultry workers with respiratory symptoms.Methods:Using Illumina Mi Seq,whole-genome sequencing was carried out to assess the evolutionary dynamics of three AOAV-1 isolates.A phylogenetic and comparative analysis of all coding genes was done using bioinformatics tools.Results:Phylogenetic analysis and genetic distance estimation suggested a close relationship among human-and avian-originated velogenic strains of genotypeⅩⅢ,sub-genotypeⅩⅢ.2.1.Several substitutions in the significant structural and biological motifs were exclusively identified in the human-originated strains.Conclusions:To our knowledge,this is the first report of a velogenic AOAV-1 isolate from natural infection of the human upper respiratory tract.Our findings highlight the evolution and zoonotic potential of velogenic AOAV-1 in a disease endemic setting.展开更多
More than 60% human infectious diseases have zoonotic origin. Cross species transmission of pathogens is a continuous, dynamic process that occurs throughout the world, giving rise to epizootic (temporary, limited inf...More than 60% human infectious diseases have zoonotic origin. Cross species transmission of pathogens is a continuous, dynamic process that occurs throughout the world, giving rise to epizootic (temporary, limited infection), endemic (on-going infection limited to a defined geographic region) and pandemic viral infections (infection spreading to every part of the world) like the current COVID-19 pandemic, which depends on the existing conditions on the ground. In Nov 2021, sudden mortality of numerous migrating demoiselle cranes was reported from their resting site near Jodhpur, Rajasthan. The symptomatic cranes became gradually weak and were unable to fly. They eventually fell dead which caused concern locally, given the current prevailing SARS-CoV-2 pandemic situation the world over. By the end of Dec 2021, the number of cranes with mortality and morbidity reduced, making it a temporary “epizootic infection”. Molecular diagnosis carried out at a specialized laboratory identified the etiological agent to be the highly pathogenic Avian Influenza Virus H5N1 (HPAIV), which has been responsible for morbidity of avian species from different parts of the world. There was no report of spreading the H5N1 AIV infection from the infected migratory cranes to nearby chicken farms or pig farms for now. In the absence of vaccines against the highly pathogenic H5N1 AIVs, and the inherent ability of influenza viruses, both avian AIV and human IAVs to constantly mutate its envelope gene or the surface antigens, resulting from the error-prone nature of the viral RNA Polymerase enzyme are the roadblocks for development of a universal, broad-spectrum influenza vaccine. Even when such a universal vaccine against H5N1 is available, vaccinating a large number of wild migratory cranes would be difficult. However, it is possible and indeed necessary to vaccinate chickens in poultry farms and pigs in farms that raise pigs for human consumption.展开更多
Non-pharmaceutical interventions(NPIs)have been proven effective in reducing the spread of the coronavirus disease 2019(COVID-19),but their broader impact on gastrointestinal disorders remains poorly studied.Here,we r...Non-pharmaceutical interventions(NPIs)have been proven effective in reducing the spread of the coronavirus disease 2019(COVID-19),but their broader impact on gastrointestinal disorders remains poorly studied.Here,we report an observational analysis and retrospective study that compares the incidence of acute diarrheal diseases in Hangzhou,Zhejiang,China,between 2019 and 2020,with an examination of the antimicrobial resistance and genetic spectrum of non-typhoidal Salmonella(NTS)from 2015 to 2022,before and during the COVID-19 pandemic.Our findings underscore that NPIs related to COVID-19 effectively reduced the incidence of acute diarrhea,with a substantial decrease in most enteric pathogens.Notably,NTS exhibited an unexpected surge.Further genomic investigations of NTS isolates revealed an overall reduction in antimicrobial-resistant(AMR),disinfection-tolerant,and virulent capabilities,but with marked variations detected between human and animal isolates.Additional genome-based analysis confirmed a decrease in the scale of zoonotic transmission in response to NPIs,suggesting particular NTS types may contribute to human infections via alternative pathways.The collective findings manifested that COVID-19-related NPIs had a mixed impact on NTS infections,which may inform AMR NTS mitigation policy.展开更多
Echinococcosis is a zoonotic disease caused by parasites belonging to the genus Echinococcus that primarily affect the liver.The western plateau and pastoral areas of China are high-risk regions for hepatic cystic ech...Echinococcosis is a zoonotic disease caused by parasites belonging to the genus Echinococcus that primarily affect the liver.The western plateau and pastoral areas of China are high-risk regions for hepatic cystic echinococcosis and hepatic alveolar echinococcosis(HAE).The high late mortality rate associated with HAE underscores the critical need for early diagnosis to improve cure rates and mitigate the disease burden in endemic areas.Currently,the World Health Orga-nization recommends ultrasonography as the preferred initial screening method for hepatic echinococcosis.However,distinguishing between specific types of lesions,such as those of hepatic cystic echinococcosis and HAE,and other focal liver lesions is challenging.To address this issue,contrast-enhanced ultrasound is recommended as a tool to differentiate solid and cysto-solid hepatic echino-coccosis from other focal liver lesions,significantly enhancing diagnostic accuracy.In this comprehensive review,we discuss the progression of hepatic echinococcosis and detail the imaging features of various types of echinococcosis using conventional,contrast-enhanced,and intraoperative ultrasound techniques.Our objective is to provide robust imaging evidence and guidance for early diagnosis,clinical decision making,and postoperative follow-up in regions with high disease prevalence.展开更多
Objective:To examine the socio-environmental factors associated with the assemblage of small mammals and the prevalence of Leptospira pathogen in poor suburban communities of Terengganu,Malaysia.Methods:We trapped sma...Objective:To examine the socio-environmental factors associated with the assemblage of small mammals and the prevalence of Leptospira pathogen in poor suburban communities of Terengganu,Malaysia.Methods:We trapped small mammals from 119 trapping points scattered around three suburban communities of Terengganu using sausage-baited live traps.On the average,we set up five traps for three nights at each sampling point during the trapping period.Kidneys of captured animals were harvested and processed for Leptospira investigation.Additionally,environmental survey was conducted at each trapping point to obtain information about possible variables supporting small mammal assemblage.We used a generalized linear model to evaluate the effect of different socio-environmental variables on small mammals’assemblage.Results:A total of 89 small mammals,specifically,Rattus norvegicus(n=39),Rattus rattus(n=27),Rattus exulans(n=10),Suncus murinus(n=11),and Tupaia glis(n=2)were captured from 1385 trap nights.Fourteen individuals(15.7%)of the captured animals tested positive for Leptospira bacteria using PCR detection.Results of our generalized linear model showed only residences bordering vacant lots as the variable positively associated with small mammal occurrence in the three study sites.Conclusions:Small mammal community,especially the often neglected species,could harbour and potentially contribute towards pathogenic Leptospira maintenance in the study sites.To adequately control small mammals’population and subsequent human zoonoses transmission,it is critical to advocate and promote appropriate infrastructure and suburban services,together with good hygiene practices that can reduce the animals’access to food and harborage.展开更多
Objective:To investigate the distribution pattern of animal bites in Mirjaveh,Iran from 2015 to 2020.Methods:The data on animal bites were collected from the Department of Infectious Diseases,the provincial health cen...Objective:To investigate the distribution pattern of animal bites in Mirjaveh,Iran from 2015 to 2020.Methods:The data on animal bites were collected from the Department of Infectious Diseases,the provincial health center.Monthly climatic data on precipitation and temperature during the study period were also collected.The correlation between incidence and temperature,precipitation rate,land type,and altitude was also analyzed.Results:The results showed that men were more affected by animal bites than women(76.4%,P<0.001),and the highest incidence rate occurred in the age group of 5-19 years.The incidence rate of animal bites was found to be correlated with temperature and altitude.An increase in temperature was associated with a rise in the incidence rate of animal bites.The number of animal bites increased until 2019,possibly due to an increase in the number of dogs in the area.Conclusions:Targeted interventions should be implemented to reduce the incidence of animal bites,particularly among children,housewives,and students.Improving access to appropriate treatments,increasing public awareness of the hazards of animal bites,and increasing the number of vaccinated dogs in the area are essential strategies to be considered.展开更多
Primate sanctuaries across Africa play a pivotal role in the rescue and rehabilitation of confiscated and rescued wild primates, many of whom have had extensive contact with humans prior to their arrival and throughou...Primate sanctuaries across Africa play a pivotal role in the rescue and rehabilitation of confiscated and rescued wild primates, many of whom have had extensive contact with humans prior to their arrival and throughout the rehabilitation process, heightening the risk of disease transmission. While tuberculosis is not naturally occurring in free-living chimpanzees, it has been extensively observed in captive primates that have been in close proximity to humans or other captive primates infected with Mycobacterium tuberculosis. This case report delves into an outbreak of extra-pulmonary tuberculosis among juvenile chimpanzees within a sanctuary, detailing the associated diagnostic challenges and treatment approaches. The five cases had close contact with a caregiver infected with tuberculosis, subsequently transmitting the infection to other in-contact chimpanzees. Prolonged treatment, employing the human protocol of quadri-therapy (rifampicin, isoniazid, pyrazinamide, and ethambutol), followed by bi-therapy (rifampicin and isoniazid), resulted in complete resolution for all five cases. These cases underscore the critical importance of maintaining high levels of biosecurity, implementing effective quarantine measures, and adhering to strict hygiene practices when working with non-human primates.展开更多
Nipah virus (NiV) is a highly infectious zoonotic pathogen that poses a significant threat to human and animal health. First identified in Malaysia in 1998, NiV has since caused several outbreaks in Southeast Asia, wi...Nipah virus (NiV) is a highly infectious zoonotic pathogen that poses a significant threat to human and animal health. First identified in Malaysia in 1998, NiV has since caused several outbreaks in Southeast Asia, with sporadic cases reported in Bangladesh and India. The virus is primarily transmitted to humans through direct contact with infected animals, primarily fruit bats, or through the consumption of contaminated fruits and their juices. NiV infection presents a wide spectrum of clinical features, ranging from mild respiratory illness to severe encephalitis, with a high case fatality rate. The incubation period typically ranges from 4 to 14 days, during which patients develop fever, headache, myalgia, and respiratory symptoms such as cough and sore throat. As the disease progresses, neurological signs become prominent, including altered consciousness, seizures, and focal deficits. Severe cases may exhibit acute respiratory distress syndrome and multi organ failure. Laboratory findings often include lymphocytopenia, thrombocytopenia, and elevated liver enzymes. Diagnosis of NiV infection requires specialized laboratory testing, including reverse transcription-polymerase chain reaction (RT-PCR) and serological assays. Currently, no specific antiviral treatment exists for NiV infection, and management primarily focuses on supportive care. Prevention and control strategies encompass public health interventions, surveillance, and raising awareness among healthcare providers and the general population. The emergence and re-emergence of NiV highlight the urgent need for continued research, improved diagnostic capabilities, and the development of effective vaccines and therapeutics to mitigate the impact of this deadly virus.展开更多
Background: Visceral leishmaniasis (VL) is one of the most important neglected tropical diseases. Although VL was controlled in several regions of China during the last century, the mountain-type zoonotic visceral lei...Background: Visceral leishmaniasis (VL) is one of the most important neglected tropical diseases. Although VL was controlled in several regions of China during the last century, the mountain-type zoonotic visceral leishmaniasis (MT-ZVL) has reemerged in the hilly areas of China in recent decades. The purpose of this study was to construct an indicator framework for assessing the risk of the MT-ZVL in China, and to provide guidance for preventing disease.Methods: Based on a literature review and expert interview, a 3-level indicator framework was initially established in November 2021, and 28 experts were selected to perform two rounds of consultation using the Delphi method. The comprehensive weight of the tertiary indicators was determined by the Delphi and the entropy weight methods.Results: Two rounds of Delphi consultation were conducted. Four primary indicators, 11 secondary indicators, and 35 tertiary indicators were identified. The Delphi-entropy weight method was performed to calculate the comprehensive weight of the tertiary indicators. The normalized weights of the primary indicators were 0.268, 0.261, 0.242, and 0.229, respectively, for biological factors, interventions, environmental factors, and social factors. The normalized weights of the top four secondary indicators were 0.122, 0.120, 0.098, and 0.096, respectively, for climatic features, geographical features, sandflies, and dogs. Among the tertiary indicators, the top four normalized comprehensive weights were the population density of sandflies (0.076), topography (0.057), the population density of dogs, including tethering (0.056), and use of bed nets or other protective measures (0.056).Conclusions: An indicator framework of transmission risk assessment for MT-ZVL was established using the Delphientropy weight method. The framework provides a practical tool to evaluate transmission risk in endemic areas.展开更多
As a natural reservoir of manifold zoonotic viruses, fruit bats have been involved in at least three emerging zoonoses in recent years. This paper aims to intro-duce the epidemiological characteristics of these diseas...As a natural reservoir of manifold zoonotic viruses, fruit bats have been involved in at least three emerging zoonoses in recent years. This paper aims to intro-duce the epidemiological characteristics of these diseases emerged in the Australasian region between 1994 and 1999, transmission pathways of the newly discovered viruses and the relationship between the changed entironment of fruit bats and occurrences of these emerging diseases and provide a clue for the epidemiological investigations of SARS.展开更多
Background:The invasive alien species may lead to great environmental and economic crisis due to its strong capability of occupying the biological niche of native species and altering the ecosystem of the invaded area...Background:The invasive alien species may lead to great environmental and economic crisis due to its strong capability of occupying the biological niche of native species and altering the ecosystem of the invaded area.However,its potential to serve as the vectors of some specific zoonotic pathogens,especially parasites,has been neglected.Thus,the damage that it may cause has been hugely underestimated in this aspect,which is actually an important public health problem.This paper aims to discuss the current status of zoonotic parasites carried by invasive alien species in China.Main body:This review summarizes the reported zoonotic parasites carried by invasive alien species in China based on the Database of Invasive Alien Species in China.We summarize their prevalence,threat to human health,related reported cases,and the roles of invasive alien species in the life cycle of these parasites,and the invasion history of some invasive alien species.Furthermore,we sum up the current state of prevention and control of invasive alien species in China,and discuss about the urgency and several feasible strategies for the prevention and control of these zoonoses under the background of booming international communications and inevitable globalization.Conclusions:Information of the zoonotic parasites carried by invasive alien species neither in China or worldwide,especially related case reports,is limited due to a long-time neglection and lack of monitoring.The underestimation of their damage requires more attention to the monitoring and control and compulsory measures should be taken to control the invasive alien species carrying zoonotic parasites.展开更多
文摘Nipah Virus (NiV), a member of the Paramyxoviridae family, is one of the most infectious zoonotic viruses in Southeast Asia. First recorded in Malaysia in 1998, the NiV outbreak infected hundreds of people, with an almost 50% death rate. The virus is transmitted through direct contact with contaminated subjects and infecting the human respiratory system. Ephrin B2 and B3, the surface glycoproteins on the host cell, have been the primary and the most effective route for viral entrance. Binding with viral surface G protein, the F protein triggers, enabling viral-host fusion. Until now, NiV vaccines are not yet available in the public market, however, preventions such as avoiding direct contact and masking are advised.
文摘This review represents an updated scenario on the transmission cycle,epidemiology,clinical features and pathogenicity,diagnosis and treatment,and prevention and control measures of a cestode parasite Echincoccus granulosus(E.granulosus) infection causing cystic echinococcosis (CE) in humans.Human CE is a serious life-threatening neglected zoonotic disease that occurs in both developing and developed countries,and is recognized as a major public health problem. The life cycle of E.granulosus involves a definitive host(dogs and other canids) for the adult E.granulosus that resides in the intestine,and an intermediate host(sheep and other herbivores) for the tissue-invading metacestode(larval) stage.Humans are only incidentally infected;since the completion of the life cycle of E.granulosus depends on carnivores feeding on herbivores bearing hydatid cysts with viable protoscoleces,humans represent usually the dead end for the parasite.On ingestion of E.granulosus eggs,hydatid cysts are formed mostly in liver and lungs, and occasionally in other organs of human body,which are considered as uncommon sites of localization of hydatid cysts.The diagnosis of extrahepatic echinococcal disease is more accurate today because of the availability of new imaging techniques,and the current treatments include surgery and percutaneous drainage,and chemotherapy(albendazole and mebendazole).But.the wild animals that involve in sylvatic cycle may overlap and interact with the domestic sheepdog cycle,and thus complicating the control efforts.The updated facts and phenomena regarding human and animal CE presented herein are due to the web search of SCI and non-SCI journals.
文摘The ongoing pandemic of coronavirus disease 2019 (COVID-19), caused by infection with human coronavirus 2019 (HCoV-19/SARS-CoV-2/2019-nCoV), is a global threat to the human population. Here, we briefly summarize the available data for the zoonotic origins of HCoV-19, with reference to the other two epidemics of highly virulent coronaviruses, SARSCoV and MERS-CoV, which cause severe pneumonia in humans. We propose to intensify future efforts for tracing the origins of HCoV-19, which is a very important scientific question for the control and prevention of the pandemic.
基金financially supported by Shiraz University of Medical Sciences(grant No.94-01-04-10456)
文摘Objective: To predict the trend of cutaneous leishmaniasis and assess the relationship between the disease trend and weather variables in south of Fars province using Seasonal Autoregressive Integrated Moving Average(SARIMA) model,Methods: The trend of cutaneous leishmaniasis was predicted using Mini tab software and SARIMA model,Besides,information about the disease and weather conditions was collected monthly based on time series design during January 2010 to March 2016,Moreover,various SARIMA models were assessed and the best one was selected,Then,the model's fitness was evaluated based on normality of the residuals' distribution,correspondence between the fitted and real amounts,and calculation of Akaike Information Criteria(AIC) and Bayesian Information Criteria(BIC),Results: The study results indicated that SARIMA model(4,1,4)(0,1,0)(12) in general and SARIMA model(4,1,4)(0,1,1)(12) in below and above 15 years age groups could appropriately predict the disease trend in the study area,Moreover,temperature with a three-month delay(lag3) increased the disease trend,rainfall with a four-month delay(lag4) decreased the disease trend,and rainfall with a nine-month delay(lag9) increased the disease trend,Conclusions: Based on the results,leishmaniasis follows a descending trend in the study area in case drought condition continues,SARIMA models can suitably measure the disease trend,and the disease follows a seasonal trend.
基金supported by Hallym University Research Fund and by Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(NRF-2017R1A2B4012944&NRF-2020R1C1C1008694)
文摘Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),a novel coronavirus(CoV),has recently emerged as a significant pathogen for humans and the cause for the recent outbreak of the 2019 novel coronavirus disease(COVID-19)throughout the globe.For developing any preventive measure,an understanding of the zoonotic pattern for this virus is a necessity.We should have a clear knowledge of its reservoir host,its distribution pattern and spreading routes.Information about zoonotic reservoirs and its transmission among them can help to understand the COVID-19 outbreaks.In this article,we discuss about the bats as the zoonotic reservoir of several CoV strains,co-existence of bats and CoV/viruses,the sequence similarity of SARS-CoV-2 with bat SARS-like CoV,the probable source of the origin of SARS-CoV-2 strain and COVID-19 outbreak,intermediate host of CoVs and SARS-CoV-2,human to human transmission and the possibility to maintain the zoonotic barriers.Our knowledge about the zoonotic reservoir of SARS-CoV-2 and its transmission ability may help develop the preventive measures and control for the future outbreak of CoV.
文摘Raw poultry and poultry products are a significant source of zoonotic bacterial pathogen transmission;thus the sensitive detection of major zoonotic pathogens (Salmonella spp., Campylobacter jejuni, and Listeria monocytogenes) is a vital food safety issue. Recently, third generation PCR technology, known as droplet digital PCR (ddPCR) has been developed to be more accurate and sensitive to detect genetic targets than current quantification methods, but this technology has not been tested within an industrial setting. There is an on-going study within our laboratory is investigating the effects of sampling times and sampling methods on the cultural and molecular (via qPCR) quantification of dominant zoonotic pathogens within a poultry processing facility. This presents a unique opportunity to compare the quantification resulted from this emerging, third generation technology to traditional quantification methods currently employed by the poultry industry. The results show that ddPCR detected pathogen-specific genes from more pathogen:sampling time combinations than either the qPCR or culturing methods from the final scalder and chiller tanks at three stages of processing (Start, Mid, and End). In fact, both ddPCR and qPCR substantially outperformed culture methods commonly used in poultry processing food safety-related studies, with Salmonella recovered only from the Mid and End sampling times from the scalder tank. While neither C. jejuni nor L. monocytogenes were recovered culturally, ddPCR was able to detect their respective genes commonly throughout the processing day in both the scalder and chiller water samples. Additionally, the use of unfiltered processing water provided significantly greater detection of bacterial and pathogen-specific gene abundances than did an analysis of larger volumes of filtered water. Considering the ddPCR-derived concentrations of the bacterial pathogens were consistent with what was previously found culturally in commercial poultry processing operations, ddPCR represented a significant advancement in poultry processing zoonotic pathogen quantification.
基金Supported by a grant from Royal Dutch Embassy,Dar-es-Salaam,Tanzania(grant No.RNE/T-032)
文摘Objective:To estimate the prevalence of hydatidosis,cysticercosis,tuberculosis,leptospirosis,brucellosis and toxoplasmosis in slaughtered bovine stock(aged≥3 years)at Tanga city abattoir,Tanzania.Methods:Prevalence estimation of the five zoonotic diseases was undertaken through an active abattoir and sero-survey was carried out in Tanga city,during the period of January 2002and March 2004.Serum samples collected from a sub-sample(n=51)of the slaughter stock were serologically screened for antibodies against brucellosis,leptospirosis and toxoplasmosis using Rose Bengal plate test,microscopic agglutination test(for 5 serovars of Leptospira interrogans)and Eiken latex agglutination test,respectively.The same animals were tested for tuberculosis using the single intradermal tuberculin test.Results:Post mortem examination of 12 444 slaughter cattle(10 790 short horn zebu and 1 654 graded)over a period of twenty two months,showed a prevalence of 1.56%(194)for hydatidosis,1.49%(185)for cysticercosis and 0.32%(40)for tuberculosis.In all three zoonoses,a statistically significant difference in infection rates was noted between the short horn zebu and graded breeds(P<0.05).The overall seroprevalences of animals with brucellosis,toxoplasmosis and leptospirosis antibodies were found to be 12%,12%and 51%,respectively.The most common leptospiral antibodies detected were those against antigens of serovars Leptospira hardjo(29%),Leptospira tarassovi(18%),Leptospira bataviae(4%)and Leptospira pomona(0%).With regard to tuberculosis,10%(n=5)of the animals tested were classified as non-specific reactors or inconclusive.Conclusions:The study findings suggest that brucellosis,toxoplasmosis and leptospirosis are prevalent in Tanga and provide definitive evidence of slaughtered stock exposure to these zoonotic agents with concurrent public health consequences.
基金supported by the Pasteur Institute of Irangrant 501 awarded to Dr.Parviz Parvizi,Another part of this wok was funded by National Institute Of Health Research (NIHR) project No 63-9024
文摘Ohjective:To assess molecular characterization,distribution,seasonal activities of sandfly species and Leishmania parasites infecting them for this zoonotic cutaneous leishmaniasis focus.Methods:The collections were carried out in 2009-2011 using CDC traps,Sticky Papers and manual aspirator in and around the villages in Abarkouh district.Individual sandflies were characterized by PCR amplification and sequencing of fragments of their mitochondrial cytochrome b gene.Leishmania parasite infections within sandflies were performed by targeting Cyt b,ITS-rDNA,k-DNA and microsatellite genes.Results:The PCR assays detected only Leishmania major(L.major).All infections(30)were found in the abundant and widespread vector Phlebolomus papalasi(P.papatasi).Small numbers of other sandfly species were also screened for infections,but none was found.Sergentomyia sinloni and P.papalasi were the predominant members in all locations of this district and in all habitats throughout the trapping season.Only five other sandfly species were found,namely Phlebolomus ansari,Phlebotomus caucasicus,Phlebotomus sergenti,Sergentomyia dentata and Sergentomyia merviney.Conclusions:In the current survey,the only infections detected are of L.major in females of P.papatasi(30 out of190).The rates of infection of P.papalasi by L.major are not significantly different in compare with other locations in Iran with no diversity of parasite strains.Zoonotic cutaneous leishmaniasis may have emerged only recently in Abarkouh district,and the reason may well be the instability of the transmission cycles there.
基金supported by the Bill and Melinda Gates Foundation Global Health Program(Grant number OPPGH5336)Gondar University
文摘Objective:To investigate the zoonotic visceral leishmaniasis(ZVL) by identification of the most probable reservoir hosts using parasite isolation and analysis of a possible transmission dynamics of the disease in extra-domestic agricultural fields and rural villages.Methods:Rodents were collected from selected study sites in kala-azar endemic areas based on information for localities of kala-azar cases for screening of Leshmania infections using parasitological,serological and polymerase chain reaction(PCR) from March.2013 to January,2014.Ketamine(Clorketam Veterinary) was used to anaesthesize the rodents according the prescribed dosage(average 2 mg/kg for intra-venous route).The blood obtained using sterile needle was dropped into sterile filter paper and allowed to air dry before sealing in plastic bags.The tissues from liver,spleen and skin were macerated in Locke's solution before transferring them into NNN medium.Blood and touch smears of liver,spleen,skin and bone marrow were prepared for fixing using methanol and staining by Giemsa stain for microscopy.These tissues were also ascd for DNA extractions and PCR amplification of Leishmania infection.Results:A total of 335 rodents(13 species) were analyzed by sampling internal organs.The infection rate by PCR was 11.1%(6/54) for Arvicanthis nilothicas compared to 17.6%(3/17) and 12.5%(2/16) for Acomys cahirinus and Tarera(C) robustus respectively.Almost all the infections were found from bone marrow samples(8/48 or 16.7%) compared with 1/91(1.1%) liver,2/87(2.2%) spleen and 0/87(0%) skin.In all study sites with past human VL cases,rodents and proved vectors shared similar habitats.Conclusions:Leishmania donovani might circulate among different species of rodents in kala-azar endemic lowlands and valleys of Ethiopia by Phlebotamus orientalis and Phlebotomus martini.Detailed studies to substantiate the preliminary data on the possible role of these rodents arc urgently needed.
基金supported by the startup research grant of the Pennsylvania State University(S.V.K.)
文摘Objective:To carry out the genetic characterization and evolutionary analysis of three avian orthoavulavirus 1(AOAV-1)isolates from poultry workers with respiratory symptoms.Methods:Using Illumina Mi Seq,whole-genome sequencing was carried out to assess the evolutionary dynamics of three AOAV-1 isolates.A phylogenetic and comparative analysis of all coding genes was done using bioinformatics tools.Results:Phylogenetic analysis and genetic distance estimation suggested a close relationship among human-and avian-originated velogenic strains of genotypeⅩⅢ,sub-genotypeⅩⅢ.2.1.Several substitutions in the significant structural and biological motifs were exclusively identified in the human-originated strains.Conclusions:To our knowledge,this is the first report of a velogenic AOAV-1 isolate from natural infection of the human upper respiratory tract.Our findings highlight the evolution and zoonotic potential of velogenic AOAV-1 in a disease endemic setting.
文摘More than 60% human infectious diseases have zoonotic origin. Cross species transmission of pathogens is a continuous, dynamic process that occurs throughout the world, giving rise to epizootic (temporary, limited infection), endemic (on-going infection limited to a defined geographic region) and pandemic viral infections (infection spreading to every part of the world) like the current COVID-19 pandemic, which depends on the existing conditions on the ground. In Nov 2021, sudden mortality of numerous migrating demoiselle cranes was reported from their resting site near Jodhpur, Rajasthan. The symptomatic cranes became gradually weak and were unable to fly. They eventually fell dead which caused concern locally, given the current prevailing SARS-CoV-2 pandemic situation the world over. By the end of Dec 2021, the number of cranes with mortality and morbidity reduced, making it a temporary “epizootic infection”. Molecular diagnosis carried out at a specialized laboratory identified the etiological agent to be the highly pathogenic Avian Influenza Virus H5N1 (HPAIV), which has been responsible for morbidity of avian species from different parts of the world. There was no report of spreading the H5N1 AIV infection from the infected migratory cranes to nearby chicken farms or pig farms for now. In the absence of vaccines against the highly pathogenic H5N1 AIVs, and the inherent ability of influenza viruses, both avian AIV and human IAVs to constantly mutate its envelope gene or the surface antigens, resulting from the error-prone nature of the viral RNA Polymerase enzyme are the roadblocks for development of a universal, broad-spectrum influenza vaccine. Even when such a universal vaccine against H5N1 is available, vaccinating a large number of wild migratory cranes would be difficult. However, it is possible and indeed necessary to vaccinate chickens in poultry farms and pigs in farms that raise pigs for human consumption.
基金We would like to thank Annemieke van den Dool(Duke Kunshan University)for the critical reading of the manuscriptThis study was supported by the National Program on the Key Research Project of China(2022YFC2604201)+4 种基金the European Union’s Horizon 2020 Research and Innovation Programme(861917-SAFFI)Zhejiang Provincial Key R&D Program of China(2023C030452022C02024)Zhejiang Provincial Naturaal Science Foundation of China(LZ24C180002)Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Techonology City(2021JJLH0083).
文摘Non-pharmaceutical interventions(NPIs)have been proven effective in reducing the spread of the coronavirus disease 2019(COVID-19),but their broader impact on gastrointestinal disorders remains poorly studied.Here,we report an observational analysis and retrospective study that compares the incidence of acute diarrheal diseases in Hangzhou,Zhejiang,China,between 2019 and 2020,with an examination of the antimicrobial resistance and genetic spectrum of non-typhoidal Salmonella(NTS)from 2015 to 2022,before and during the COVID-19 pandemic.Our findings underscore that NPIs related to COVID-19 effectively reduced the incidence of acute diarrhea,with a substantial decrease in most enteric pathogens.Notably,NTS exhibited an unexpected surge.Further genomic investigations of NTS isolates revealed an overall reduction in antimicrobial-resistant(AMR),disinfection-tolerant,and virulent capabilities,but with marked variations detected between human and animal isolates.Additional genome-based analysis confirmed a decrease in the scale of zoonotic transmission in response to NPIs,suggesting particular NTS types may contribute to human infections via alternative pathways.The collective findings manifested that COVID-19-related NPIs had a mixed impact on NTS infections,which may inform AMR NTS mitigation policy.
文摘Echinococcosis is a zoonotic disease caused by parasites belonging to the genus Echinococcus that primarily affect the liver.The western plateau and pastoral areas of China are high-risk regions for hepatic cystic echinococcosis and hepatic alveolar echinococcosis(HAE).The high late mortality rate associated with HAE underscores the critical need for early diagnosis to improve cure rates and mitigate the disease burden in endemic areas.Currently,the World Health Orga-nization recommends ultrasonography as the preferred initial screening method for hepatic echinococcosis.However,distinguishing between specific types of lesions,such as those of hepatic cystic echinococcosis and HAE,and other focal liver lesions is challenging.To address this issue,contrast-enhanced ultrasound is recommended as a tool to differentiate solid and cysto-solid hepatic echino-coccosis from other focal liver lesions,significantly enhancing diagnostic accuracy.In this comprehensive review,we discuss the progression of hepatic echinococcosis and detail the imaging features of various types of echinococcosis using conventional,contrast-enhanced,and intraoperative ultrasound techniques.Our objective is to provide robust imaging evidence and guidance for early diagnosis,clinical decision making,and postoperative follow-up in regions with high disease prevalence.
文摘Objective:To examine the socio-environmental factors associated with the assemblage of small mammals and the prevalence of Leptospira pathogen in poor suburban communities of Terengganu,Malaysia.Methods:We trapped small mammals from 119 trapping points scattered around three suburban communities of Terengganu using sausage-baited live traps.On the average,we set up five traps for three nights at each sampling point during the trapping period.Kidneys of captured animals were harvested and processed for Leptospira investigation.Additionally,environmental survey was conducted at each trapping point to obtain information about possible variables supporting small mammal assemblage.We used a generalized linear model to evaluate the effect of different socio-environmental variables on small mammals’assemblage.Results:A total of 89 small mammals,specifically,Rattus norvegicus(n=39),Rattus rattus(n=27),Rattus exulans(n=10),Suncus murinus(n=11),and Tupaia glis(n=2)were captured from 1385 trap nights.Fourteen individuals(15.7%)of the captured animals tested positive for Leptospira bacteria using PCR detection.Results of our generalized linear model showed only residences bordering vacant lots as the variable positively associated with small mammal occurrence in the three study sites.Conclusions:Small mammal community,especially the often neglected species,could harbour and potentially contribute towards pathogenic Leptospira maintenance in the study sites.To adequately control small mammals’population and subsequent human zoonoses transmission,it is critical to advocate and promote appropriate infrastructure and suburban services,together with good hygiene practices that can reduce the animals’access to food and harborage.
文摘Objective:To investigate the distribution pattern of animal bites in Mirjaveh,Iran from 2015 to 2020.Methods:The data on animal bites were collected from the Department of Infectious Diseases,the provincial health center.Monthly climatic data on precipitation and temperature during the study period were also collected.The correlation between incidence and temperature,precipitation rate,land type,and altitude was also analyzed.Results:The results showed that men were more affected by animal bites than women(76.4%,P<0.001),and the highest incidence rate occurred in the age group of 5-19 years.The incidence rate of animal bites was found to be correlated with temperature and altitude.An increase in temperature was associated with a rise in the incidence rate of animal bites.The number of animal bites increased until 2019,possibly due to an increase in the number of dogs in the area.Conclusions:Targeted interventions should be implemented to reduce the incidence of animal bites,particularly among children,housewives,and students.Improving access to appropriate treatments,increasing public awareness of the hazards of animal bites,and increasing the number of vaccinated dogs in the area are essential strategies to be considered.
文摘Primate sanctuaries across Africa play a pivotal role in the rescue and rehabilitation of confiscated and rescued wild primates, many of whom have had extensive contact with humans prior to their arrival and throughout the rehabilitation process, heightening the risk of disease transmission. While tuberculosis is not naturally occurring in free-living chimpanzees, it has been extensively observed in captive primates that have been in close proximity to humans or other captive primates infected with Mycobacterium tuberculosis. This case report delves into an outbreak of extra-pulmonary tuberculosis among juvenile chimpanzees within a sanctuary, detailing the associated diagnostic challenges and treatment approaches. The five cases had close contact with a caregiver infected with tuberculosis, subsequently transmitting the infection to other in-contact chimpanzees. Prolonged treatment, employing the human protocol of quadri-therapy (rifampicin, isoniazid, pyrazinamide, and ethambutol), followed by bi-therapy (rifampicin and isoniazid), resulted in complete resolution for all five cases. These cases underscore the critical importance of maintaining high levels of biosecurity, implementing effective quarantine measures, and adhering to strict hygiene practices when working with non-human primates.
文摘Nipah virus (NiV) is a highly infectious zoonotic pathogen that poses a significant threat to human and animal health. First identified in Malaysia in 1998, NiV has since caused several outbreaks in Southeast Asia, with sporadic cases reported in Bangladesh and India. The virus is primarily transmitted to humans through direct contact with infected animals, primarily fruit bats, or through the consumption of contaminated fruits and their juices. NiV infection presents a wide spectrum of clinical features, ranging from mild respiratory illness to severe encephalitis, with a high case fatality rate. The incubation period typically ranges from 4 to 14 days, during which patients develop fever, headache, myalgia, and respiratory symptoms such as cough and sore throat. As the disease progresses, neurological signs become prominent, including altered consciousness, seizures, and focal deficits. Severe cases may exhibit acute respiratory distress syndrome and multi organ failure. Laboratory findings often include lymphocytopenia, thrombocytopenia, and elevated liver enzymes. Diagnosis of NiV infection requires specialized laboratory testing, including reverse transcription-polymerase chain reaction (RT-PCR) and serological assays. Currently, no specific antiviral treatment exists for NiV infection, and management primarily focuses on supportive care. Prevention and control strategies encompass public health interventions, surveillance, and raising awareness among healthcare providers and the general population. The emergence and re-emergence of NiV highlight the urgent need for continued research, improved diagnostic capabilities, and the development of effective vaccines and therapeutics to mitigate the impact of this deadly virus.
基金the National Key Research and Development Program of China(Nos.2021YFC2300800,2021YFC2300804)National Natural Science Foundation of China(No.32161143036).
文摘Background: Visceral leishmaniasis (VL) is one of the most important neglected tropical diseases. Although VL was controlled in several regions of China during the last century, the mountain-type zoonotic visceral leishmaniasis (MT-ZVL) has reemerged in the hilly areas of China in recent decades. The purpose of this study was to construct an indicator framework for assessing the risk of the MT-ZVL in China, and to provide guidance for preventing disease.Methods: Based on a literature review and expert interview, a 3-level indicator framework was initially established in November 2021, and 28 experts were selected to perform two rounds of consultation using the Delphi method. The comprehensive weight of the tertiary indicators was determined by the Delphi and the entropy weight methods.Results: Two rounds of Delphi consultation were conducted. Four primary indicators, 11 secondary indicators, and 35 tertiary indicators were identified. The Delphi-entropy weight method was performed to calculate the comprehensive weight of the tertiary indicators. The normalized weights of the primary indicators were 0.268, 0.261, 0.242, and 0.229, respectively, for biological factors, interventions, environmental factors, and social factors. The normalized weights of the top four secondary indicators were 0.122, 0.120, 0.098, and 0.096, respectively, for climatic features, geographical features, sandflies, and dogs. Among the tertiary indicators, the top four normalized comprehensive weights were the population density of sandflies (0.076), topography (0.057), the population density of dogs, including tethering (0.056), and use of bed nets or other protective measures (0.056).Conclusions: An indicator framework of transmission risk assessment for MT-ZVL was established using the Delphientropy weight method. The framework provides a practical tool to evaluate transmission risk in endemic areas.
文摘As a natural reservoir of manifold zoonotic viruses, fruit bats have been involved in at least three emerging zoonoses in recent years. This paper aims to intro-duce the epidemiological characteristics of these diseases emerged in the Australasian region between 1994 and 1999, transmission pathways of the newly discovered viruses and the relationship between the changed entironment of fruit bats and occurrences of these emerging diseases and provide a clue for the epidemiological investigations of SARS.
基金the National Key Research and Development Program of China(grant No.2016YFC1202003,2016YFC1202005 and 2016YFC1200500)the Projea of Basic Platform of National Science and Technology Resources of the Ministry of Sciences and Technology of China(grant No.TDRC-2017-22)+6 种基金the National Natural Science Foundation of China(grant No.81371836,81572023 and 81271855)Guangdong Natural Science Foundation(grant No.2014A030313134)Science and Technology Planning Project of Guangdong Province(grant No.2016A050502008)Science and Technology Planning Projea of Guangzhou(grant No.201607010029)the 111 Project(grant No.B12003)the Undergraduates Innovation Training Program of Guangdong Province(grant No.201410558274 and 201601084)Teaching Reform Projea of Sun Yat-sen University(grant No.2016012).
文摘Background:The invasive alien species may lead to great environmental and economic crisis due to its strong capability of occupying the biological niche of native species and altering the ecosystem of the invaded area.However,its potential to serve as the vectors of some specific zoonotic pathogens,especially parasites,has been neglected.Thus,the damage that it may cause has been hugely underestimated in this aspect,which is actually an important public health problem.This paper aims to discuss the current status of zoonotic parasites carried by invasive alien species in China.Main body:This review summarizes the reported zoonotic parasites carried by invasive alien species in China based on the Database of Invasive Alien Species in China.We summarize their prevalence,threat to human health,related reported cases,and the roles of invasive alien species in the life cycle of these parasites,and the invasion history of some invasive alien species.Furthermore,we sum up the current state of prevention and control of invasive alien species in China,and discuss about the urgency and several feasible strategies for the prevention and control of these zoonoses under the background of booming international communications and inevitable globalization.Conclusions:Information of the zoonotic parasites carried by invasive alien species neither in China or worldwide,especially related case reports,is limited due to a long-time neglection and lack of monitoring.The underestimation of their damage requires more attention to the monitoring and control and compulsory measures should be taken to control the invasive alien species carrying zoonotic parasites.