Introduction: Meningitis caused by Neisseria meningitidis constitutes a burden for the countries in the meningitis belt of sub-Saharan in general and particularly for Burkina Faso. In 2019 the Diapaga health district ...Introduction: Meningitis caused by Neisseria meningitidis constitutes a burden for the countries in the meningitis belt of sub-Saharan in general and particularly for Burkina Faso. In 2019 the Diapaga health district experienced a meningitis epidemic due to N. meningitidis serogroup C. Methods: This is a cross-sectional study with a descriptive aim in the health district of Diapaga where all cases of meningitis were included in this work. Rapid diagnostic tests (RDTs), culture as well as real-time PCR were used for the biological analysis of cerebral spinal fluid (CSF) samples. Results: Of 155 CSF samples analysed, 42% (65/155) were tested positve. Of them, N. meningitidis C accounted for 83% of all positive cases. Likewise, all thirteen (13) NmC strains were susceptible to oxacillin, ceftriaxone, penicillin and chloramphenicol. All strains of NmC belonged to the sequence type (ST) 10 217 and to the clonal complex (CC) 10 217. These CCs belonged to the same variant PorA type: P1.21-15.16;FetA type: F1-7;PorB type: 3-463. Conclusion: Burkina Faso had known an epidemic of meningitis caused by NmC in 2019 in the health district of Diapaga. This outbreak was contained in time due to the performance of the epidemiological surveillance system which made it possible to investigate on time and introduce the vaccine against the pathogen NmC.展开更多
Objective To characterize the meningococcal strains isolated from cases and close contacts with meningococcal disease associated with an outbreak in a jail in May 2010 by investigating the national distribution of hyp...Objective To characterize the meningococcal strains isolated from cases and close contacts with meningococcal disease associated with an outbreak in a jail in May 2010 by investigating the national distribution of hyperinvasive ST-4821 serogroup C clone associated with this outbreak. Methods The cases were described based on the clinical symptoms and laboratory results. Pharyngeal swabs were cultured for N. meningitidis from men in the jail. Meningococcal isolates were identified by serogrouping, pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST), respectively. Four hundred and sixteen serogroup C N. meningitidis strains were collected from 27 provinces between 2003 and 2010 for a nationwide survey and analyzed by PFGE and MLST. Results Three persons in a jail system were infected with invasive N. meningitidis serogroup C. All isolates tested had matching PFGE patterns and belonged to the multilocus sequence type (ST) 4821 clonal complex. All 47 N. meningitidis strains were identified from the pharyngeal swabs of 166 peoples in the jail, and 26 of them belonged to ST-4821 serogroup C clone, and 90.14% (375/416) serogroup C strains identified in the nationwide survey belonged to the ST-4821 complex. The ST-4821 serogroup C clone was spread nationwide, distributed in 24 provinces, especially in eastern provinces between 2003 and 2010. Conclusion Endemic transmission and carriage rate of ST-4821 serogroup C clone are high in this jail system. The ST-4821 serogroup C clone is spreading in China and nationwide distributed despite the existence of some effective vaccines.展开更多
Objective During 2003-2005, an outbreak of meningitis due to Neisseria meningitidis serogroup C occurred in China. With the aim to find strain clues result in the final epidemics, the ancestral strain 053442, a clinic...Objective During 2003-2005, an outbreak of meningitis due to Neisseria meningitidis serogroup C occurred in China. With the aim to find strain clues result in the final epidemics, the ancestral strain 053442, a clinical isolate, and a carrier strain 053426 with different gene type were analyzed. Methods Clinical strain 053442 and carrier strain 053426 were cultured on GC agar plates under the same condition. Two-dimensional electrophoresis was performed using the pH 3–10 nonlinear IPG strips of 24 cm length, and all the protein spots were identified by matrix-assisted laser desorption/ionization time of flight spectrometry. Results 502 and 380 protein spots were identified in 053426 and 053442 respectively, relating to 266 and 202 different genes covering a wide range of cellular functions. The express volume and number of proteins involved in energy metabolism, protein synthesis and amino acid biosynthesis in 053426 were higher than in 053442. Virulence factor Opa, Opc and a series of proteins involved in pilus assembly and retraction were identified in 053442, which appear to be of primary importance in colonization and invasion of human cells. Compared to 053442, virulence protein species were less in 053426, with lower express volumes too. No Opa and Opc were detected in 053426. Conclusion The different protein expression profiles of the clinical strain 053442 and carrier strain 053426 in the present study provide some clues of the different pathogenicity of the two strains, which may account for result in the final epidemics.展开更多
Infectious conjunctivitis is a very common presentation to medical professional and ophthalmologist all over the world.Although its typically self-limiting and treatable in almost all of the cases,but we need to be aw...Infectious conjunctivitis is a very common presentation to medical professional and ophthalmologist all over the world.Although its typically self-limiting and treatable in almost all of the cases,but we need to be aware of the rare and potentially life threatening if the cause is not promptly identified and treated accordingly.In our case report,we highlighted the rare case of Neisseria meningitidis as a primary cause of keratoconjunctivitis.Neisseria meningitidis is a rare etiology of keratoconjunctivitis and its ocular presentations are quite similar with other bacterial or viral infection.The infection may potentially fatal if systemic invasion occurred,however with immediate and proper treatment the outcome is satisfactory.Early diagnosis and proper antibiotic treatment are critical to prevent systemic spread of the infection.Public health intervention is needed to prevent outbreak of the disease.展开更多
Objective:To determine the antimicrobial susceptibility and serotypes of Neisseria(N.)meningitidis and Streptococcus(S.)pneumoniae in Sri Lankan patients.Methods:We retrospectively analyzed 11 blood culture specimens ...Objective:To determine the antimicrobial susceptibility and serotypes of Neisseria(N.)meningitidis and Streptococcus(S.)pneumoniae in Sri Lankan patients.Methods:We retrospectively analyzed 11 blood culture specimens from suspected patients with invasive meningococcal disease and 26 S.pneumoniae clinical isolates.We tested 6 antimicrobials against N.meningitidis and 12 antimicrobials against S.pneumoniae.Meningococcal serogroup was determined by realtime PCR and Quellung serotyping was used for pneumococcal analysis.Results:N.meningitidis serogroup B was the most common in this study.Intermediate-susceptibility to penicillin was seen in 75.0%(6/8)of strains.Susceptibility to ciprofloxacin,levofloxacin and cotrimoxazole was 62.5%(5/8),62.5%(5/8)and 87.5%(7/8),respectively.Excellent susceptibility was seen in cefotaxime and meropenem.In S.pneumoniae,the most common serotype was 19F in both invasive and non-invasive pneumococcal diseases.The majority of strains showed multidrug resistance.Penicillin non-susceptibility in non-meningeal strains were 13.6%and all meningeal strains were penicillin resistant.Erythromycin was highly resistant in both groups.Amoxicillin showed excellent susceptibility in non-invasive pneumococcal diseases strains.Linezolid,levofloxacin and vancomycin showed 100.0%susceptibility in all pneumococcal isolates.Conclusions:Implementation of vaccines should be considered,especially for children and high-risk populations.This may contribute to reducing pneumococcal and meningococcal invasive disease burden and help prevent emergence of antimicrobial resistant strains.展开更多
Neisseria meningitidis(N.meningitidis) is an exclusively human pathogen that has been identified in 10%-35% of the adult population and in 5.9% of the child population.Despite the high prevalence of carriers of N.meni...Neisseria meningitidis(N.meningitidis) is an exclusively human pathogen that has been identified in 10%-35% of the adult population and in 5.9% of the child population.Despite the high prevalence of carriers of N.meningitidis,it only occasionally causes meningococcal disease in the context of endemic disease,in certain geographic areas or in isolated epidemic outbreaks.After the N.meningitidis genome is described,progress has been made toward understanding the pathogenic mechanisms of the bacteria,although some aspects concerning its interaction with the environment and the host remain unclear.Some studies have reported that oxidative stress in the environment can modify the surface characteristics of N.meningitidis,increasing its adhesive properties and favouring an asymptomaticcarrier state.The antigenic structure of N.meningitidis can be modified by its importing genetic material from other bacteria in its ecological niche.Some structures of lipopolysaccharides help it to evade the immune response,and these are observed more frequently in N.meningitidis isolated from blood than in healthy nasopharyngeal carriers.There is evidence that pili and capsule are downregulated upon contact with target cells.This paper reviews current knowledge on hostenvironment-bacteria mechanisms and interactions,with the aim of contributing to our understanding of the pathogenic mechanisms of N.meningitidis.展开更多
Neisseria meningitidis is the leading cause of bacterial meningitis and classified into 13serogroups based on the immunological reactivity of the capsular polysaccharide.1 Serogroups A, B, C, W135 and Y are the most c...Neisseria meningitidis is the leading cause of bacterial meningitis and classified into 13serogroups based on the immunological reactivity of the capsular polysaccharide.1 Serogroups A, B, C, W135 and Y are the most common causes of meningitis.2 Among them, serogroup A and C are the major causes of epidemics in Africa and Asia.2 Most of the epidemic outbreaks of meningococcal meningitis are caused by serogroup A Neisseria meningitidis strain from the 1950s to the 1980s in China.3 During the years 2003 and 2005, a new sequence type (ST-4821) of serogroup C was identified in the Anhui and 11 other provinces of China.4展开更多
Neisseria meningitidis (N. meningitidis) is classified into 13 serogroups based on the immunological reactivity of the capsular polysaccharide.Serogourp-s A,B and C are responsible for over 90% of meningococcal dise...Neisseria meningitidis (N. meningitidis) is classified into 13 serogroups based on the immunological reactivity of the capsular polysaccharide.Serogourp-s A,B and C are responsible for over 90% of meningococcal disease.2 In developed countries, endemic disease is generally caused by serogroups B and C.展开更多
Neisseria meningitidis is the agent of invasive meningococcal disease, including cerebral meningitis and septicemia. Because the diseases caused by different clonal groups (sequence types) have their own epidemiolog...Neisseria meningitidis is the agent of invasive meningococcal disease, including cerebral meningitis and septicemia. Because the diseases caused by different clonal groups (sequence types) have their own epidemiological characteristics, it is important to understand the differences among the genomes of the N. meningitidis clonal groups. To this end, a novel interpretation of a structural dot plot of genomes was devised and applied; exact nu- cleotide matches between the genomes ofN. meningitidis serogroup A strain Z2491 and serogroup B strain MC58 were identified, leading to the specification of various structural regions. Known and putative virulence genes for each N. meningitidis strain were then classified into these regions. We found that virulence genes of MC58 tend more to the translocated regions (chromosomal segments in new sequence contexts) than do those of Z2491, notably tending towards the interface between one of the translocated regions and the collinear region. Within the col- linear region, virulence genes tend to occur within 16 kb of gaps in the exact matches. Verification of these tendencies using genes clustered in the cps locus was sufficiently supportive to suggest that these tendencies can be used to focus the search for and understanding of virulence genes and mechanisms of pathogenicity in these two organisms.展开更多
目的了解贵州省健康人群流脑病原菌带菌状况,为流脑的防治工作提供科学依据。方法采集健康人群和病例密切接触者的咽拭标本进行培养、鉴定和分析。结果从904份健康人群标本和56份病例密切接触者的咽拭标本中分别培养出17株和6株脑膜炎...目的了解贵州省健康人群流脑病原菌带菌状况,为流脑的防治工作提供科学依据。方法采集健康人群和病例密切接触者的咽拭标本进行培养、鉴定和分析。结果从904份健康人群标本和56份病例密切接触者的咽拭标本中分别培养出17株和6株脑膜炎奈瑟菌,其中19株(82.61%)为 A 群,平均检出率分别为1.88%和10.71%。10~14岁年龄组学生的带菌率最高,为5.56%。从44份病人脑脊液标本培养出5株脑膜炎奈瑟菌,均为 A 群。结论目前贵州省流脑的流行菌群仍然以 A 群为主,高危人群主要以14岁以下学生为主。提示今后贵州省预防控制流脑的重点应该是加强流脑疫苗的预防接种和流脑病原学监测。展开更多
目的分析江西省2006-2010年分离的C群脑膜炎奈瑟菌的药物敏感性及分子特征。方法采用E-test试纸条检测方法对38株C群脑膜炎奈瑟菌菌株进行体外抗菌药物敏感性检测,利用脉冲场凝胶电泳技术(Pulsed-Field Gel Electrophoresis,PFGE)进行...目的分析江西省2006-2010年分离的C群脑膜炎奈瑟菌的药物敏感性及分子特征。方法采用E-test试纸条检测方法对38株C群脑膜炎奈瑟菌菌株进行体外抗菌药物敏感性检测,利用脉冲场凝胶电泳技术(Pulsed-Field Gel Electrophoresis,PFGE)进行分子特征分析。结果所有菌株对氯霉素、美洛培南、阿奇霉素、米洛环素、头孢噻肟、头孢曲松和利福平均敏感;15(39.5%)株菌株对青霉素不敏感,18(47.4%)株对氨苄西林不敏感,25(65.8%)株对环丙沙星耐药,23(60.5%)株对左氧氟沙星耐药,11(28.9%)株对复方新诺明不敏感。PFGE分型显示以AH1和AH2型为主,并且同一地区的带型以同一种带型为主。结论江西省2006-2010年分离C群脑膜炎奈瑟菌株对喹诺酮类药物具有较高的耐药性,还有大部分菌对磺胺类和青霉素类药物也不敏感。PFGE分型特征虽然呈多态性,但是以AH1和AH2型为优势克隆型。展开更多
文摘Introduction: Meningitis caused by Neisseria meningitidis constitutes a burden for the countries in the meningitis belt of sub-Saharan in general and particularly for Burkina Faso. In 2019 the Diapaga health district experienced a meningitis epidemic due to N. meningitidis serogroup C. Methods: This is a cross-sectional study with a descriptive aim in the health district of Diapaga where all cases of meningitis were included in this work. Rapid diagnostic tests (RDTs), culture as well as real-time PCR were used for the biological analysis of cerebral spinal fluid (CSF) samples. Results: Of 155 CSF samples analysed, 42% (65/155) were tested positve. Of them, N. meningitidis C accounted for 83% of all positive cases. Likewise, all thirteen (13) NmC strains were susceptible to oxacillin, ceftriaxone, penicillin and chloramphenicol. All strains of NmC belonged to the sequence type (ST) 10 217 and to the clonal complex (CC) 10 217. These CCs belonged to the same variant PorA type: P1.21-15.16;FetA type: F1-7;PorB type: 3-463. Conclusion: Burkina Faso had known an epidemic of meningitis caused by NmC in 2019 in the health district of Diapaga. This outbreak was contained in time due to the performance of the epidemiological surveillance system which made it possible to investigate on time and introduce the vaccine against the pathogen NmC.
基金supported by Research Fund from Ministry of Health and Ministry of Science and Technology of the People’s Republic of China,2013ZX10004221,2012ZX10004215,and 2011CB504900
文摘Objective To characterize the meningococcal strains isolated from cases and close contacts with meningococcal disease associated with an outbreak in a jail in May 2010 by investigating the national distribution of hyperinvasive ST-4821 serogroup C clone associated with this outbreak. Methods The cases were described based on the clinical symptoms and laboratory results. Pharyngeal swabs were cultured for N. meningitidis from men in the jail. Meningococcal isolates were identified by serogrouping, pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST), respectively. Four hundred and sixteen serogroup C N. meningitidis strains were collected from 27 provinces between 2003 and 2010 for a nationwide survey and analyzed by PFGE and MLST. Results Three persons in a jail system were infected with invasive N. meningitidis serogroup C. All isolates tested had matching PFGE patterns and belonged to the multilocus sequence type (ST) 4821 clonal complex. All 47 N. meningitidis strains were identified from the pharyngeal swabs of 166 peoples in the jail, and 26 of them belonged to ST-4821 serogroup C clone, and 90.14% (375/416) serogroup C strains identified in the nationwide survey belonged to the ST-4821 complex. The ST-4821 serogroup C clone was spread nationwide, distributed in 24 provinces, especially in eastern provinces between 2003 and 2010. Conclusion Endemic transmission and carriage rate of ST-4821 serogroup C clone are high in this jail system. The ST-4821 serogroup C clone is spreading in China and nationwide distributed despite the existence of some effective vaccines.
基金supported by a grant (the Key Technologies R&D Program 2005BA711A09) from the Ministry of Science and Technology, of China
文摘Objective During 2003-2005, an outbreak of meningitis due to Neisseria meningitidis serogroup C occurred in China. With the aim to find strain clues result in the final epidemics, the ancestral strain 053442, a clinical isolate, and a carrier strain 053426 with different gene type were analyzed. Methods Clinical strain 053442 and carrier strain 053426 were cultured on GC agar plates under the same condition. Two-dimensional electrophoresis was performed using the pH 3–10 nonlinear IPG strips of 24 cm length, and all the protein spots were identified by matrix-assisted laser desorption/ionization time of flight spectrometry. Results 502 and 380 protein spots were identified in 053426 and 053442 respectively, relating to 266 and 202 different genes covering a wide range of cellular functions. The express volume and number of proteins involved in energy metabolism, protein synthesis and amino acid biosynthesis in 053426 were higher than in 053442. Virulence factor Opa, Opc and a series of proteins involved in pilus assembly and retraction were identified in 053442, which appear to be of primary importance in colonization and invasion of human cells. Compared to 053442, virulence protein species were less in 053426, with lower express volumes too. No Opa and Opc were detected in 053426. Conclusion The different protein expression profiles of the clinical strain 053442 and carrier strain 053426 in the present study provide some clues of the different pathogenicity of the two strains, which may account for result in the final epidemics.
文摘Infectious conjunctivitis is a very common presentation to medical professional and ophthalmologist all over the world.Although its typically self-limiting and treatable in almost all of the cases,but we need to be aware of the rare and potentially life threatening if the cause is not promptly identified and treated accordingly.In our case report,we highlighted the rare case of Neisseria meningitidis as a primary cause of keratoconjunctivitis.Neisseria meningitidis is a rare etiology of keratoconjunctivitis and its ocular presentations are quite similar with other bacterial or viral infection.The infection may potentially fatal if systemic invasion occurred,however with immediate and proper treatment the outcome is satisfactory.Early diagnosis and proper antibiotic treatment are critical to prevent systemic spread of the infection.Public health intervention is needed to prevent outbreak of the disease.
文摘Objective:To determine the antimicrobial susceptibility and serotypes of Neisseria(N.)meningitidis and Streptococcus(S.)pneumoniae in Sri Lankan patients.Methods:We retrospectively analyzed 11 blood culture specimens from suspected patients with invasive meningococcal disease and 26 S.pneumoniae clinical isolates.We tested 6 antimicrobials against N.meningitidis and 12 antimicrobials against S.pneumoniae.Meningococcal serogroup was determined by realtime PCR and Quellung serotyping was used for pneumococcal analysis.Results:N.meningitidis serogroup B was the most common in this study.Intermediate-susceptibility to penicillin was seen in 75.0%(6/8)of strains.Susceptibility to ciprofloxacin,levofloxacin and cotrimoxazole was 62.5%(5/8),62.5%(5/8)and 87.5%(7/8),respectively.Excellent susceptibility was seen in cefotaxime and meropenem.In S.pneumoniae,the most common serotype was 19F in both invasive and non-invasive pneumococcal diseases.The majority of strains showed multidrug resistance.Penicillin non-susceptibility in non-meningeal strains were 13.6%and all meningeal strains were penicillin resistant.Erythromycin was highly resistant in both groups.Amoxicillin showed excellent susceptibility in non-invasive pneumococcal diseases strains.Linezolid,levofloxacin and vancomycin showed 100.0%susceptibility in all pneumococcal isolates.Conclusions:Implementation of vaccines should be considered,especially for children and high-risk populations.This may contribute to reducing pneumococcal and meningococcal invasive disease burden and help prevent emergence of antimicrobial resistant strains.
文摘Neisseria meningitidis(N.meningitidis) is an exclusively human pathogen that has been identified in 10%-35% of the adult population and in 5.9% of the child population.Despite the high prevalence of carriers of N.meningitidis,it only occasionally causes meningococcal disease in the context of endemic disease,in certain geographic areas or in isolated epidemic outbreaks.After the N.meningitidis genome is described,progress has been made toward understanding the pathogenic mechanisms of the bacteria,although some aspects concerning its interaction with the environment and the host remain unclear.Some studies have reported that oxidative stress in the environment can modify the surface characteristics of N.meningitidis,increasing its adhesive properties and favouring an asymptomaticcarrier state.The antigenic structure of N.meningitidis can be modified by its importing genetic material from other bacteria in its ecological niche.Some structures of lipopolysaccharides help it to evade the immune response,and these are observed more frequently in N.meningitidis isolated from blood than in healthy nasopharyngeal carriers.There is evidence that pili and capsule are downregulated upon contact with target cells.This paper reviews current knowledge on hostenvironment-bacteria mechanisms and interactions,with the aim of contributing to our understanding of the pathogenic mechanisms of N.meningitidis.
文摘Neisseria meningitidis is the leading cause of bacterial meningitis and classified into 13serogroups based on the immunological reactivity of the capsular polysaccharide.1 Serogroups A, B, C, W135 and Y are the most common causes of meningitis.2 Among them, serogroup A and C are the major causes of epidemics in Africa and Asia.2 Most of the epidemic outbreaks of meningococcal meningitis are caused by serogroup A Neisseria meningitidis strain from the 1950s to the 1980s in China.3 During the years 2003 and 2005, a new sequence type (ST-4821) of serogroup C was identified in the Anhui and 11 other provinces of China.4
文摘Neisseria meningitidis (N. meningitidis) is classified into 13 serogroups based on the immunological reactivity of the capsular polysaccharide.Serogourp-s A,B and C are responsible for over 90% of meningococcal disease.2 In developed countries, endemic disease is generally caused by serogroups B and C.
文摘Neisseria meningitidis is the agent of invasive meningococcal disease, including cerebral meningitis and septicemia. Because the diseases caused by different clonal groups (sequence types) have their own epidemiological characteristics, it is important to understand the differences among the genomes of the N. meningitidis clonal groups. To this end, a novel interpretation of a structural dot plot of genomes was devised and applied; exact nu- cleotide matches between the genomes ofN. meningitidis serogroup A strain Z2491 and serogroup B strain MC58 were identified, leading to the specification of various structural regions. Known and putative virulence genes for each N. meningitidis strain were then classified into these regions. We found that virulence genes of MC58 tend more to the translocated regions (chromosomal segments in new sequence contexts) than do those of Z2491, notably tending towards the interface between one of the translocated regions and the collinear region. Within the col- linear region, virulence genes tend to occur within 16 kb of gaps in the exact matches. Verification of these tendencies using genes clustered in the cps locus was sufficiently supportive to suggest that these tendencies can be used to focus the search for and understanding of virulence genes and mechanisms of pathogenicity in these two organisms.
文摘目的了解贵州省健康人群流脑病原菌带菌状况,为流脑的防治工作提供科学依据。方法采集健康人群和病例密切接触者的咽拭标本进行培养、鉴定和分析。结果从904份健康人群标本和56份病例密切接触者的咽拭标本中分别培养出17株和6株脑膜炎奈瑟菌,其中19株(82.61%)为 A 群,平均检出率分别为1.88%和10.71%。10~14岁年龄组学生的带菌率最高,为5.56%。从44份病人脑脊液标本培养出5株脑膜炎奈瑟菌,均为 A 群。结论目前贵州省流脑的流行菌群仍然以 A 群为主,高危人群主要以14岁以下学生为主。提示今后贵州省预防控制流脑的重点应该是加强流脑疫苗的预防接种和流脑病原学监测。
文摘目的分析江西省2006-2010年分离的C群脑膜炎奈瑟菌的药物敏感性及分子特征。方法采用E-test试纸条检测方法对38株C群脑膜炎奈瑟菌菌株进行体外抗菌药物敏感性检测,利用脉冲场凝胶电泳技术(Pulsed-Field Gel Electrophoresis,PFGE)进行分子特征分析。结果所有菌株对氯霉素、美洛培南、阿奇霉素、米洛环素、头孢噻肟、头孢曲松和利福平均敏感;15(39.5%)株菌株对青霉素不敏感,18(47.4%)株对氨苄西林不敏感,25(65.8%)株对环丙沙星耐药,23(60.5%)株对左氧氟沙星耐药,11(28.9%)株对复方新诺明不敏感。PFGE分型显示以AH1和AH2型为主,并且同一地区的带型以同一种带型为主。结论江西省2006-2010年分离C群脑膜炎奈瑟菌株对喹诺酮类药物具有较高的耐药性,还有大部分菌对磺胺类和青霉素类药物也不敏感。PFGE分型特征虽然呈多态性,但是以AH1和AH2型为优势克隆型。