Background:The uroculturome indicates the profile of culturable microbes inhabiting the urinary tract,and it is often required to do a urine culture to find an effective antimicrobial to treat urinary tract infections...Background:The uroculturome indicates the profile of culturable microbes inhabiting the urinary tract,and it is often required to do a urine culture to find an effective antimicrobial to treat urinary tract infections(UTIs).Methods:This study targeted to understand the profile of culturable pathogens in the urine of apparently healthy(128)and humans with clinical UTIs(161)and their antimicrobial susceptibility.All the urine samples were analyzed to quantify microbial load and determine the diversity and antimicrobial susceptibility of microbes following standard microbiological methods.Results:In urine samples from UTI cases,microbial counts were 1.2×10^(4)±6.02×10^(3) colony-forming units(cfu)/mL,while in urine samples from apparently healthy humans,the average count was 3.33±1.34×10^(3) cfu/mL.In eight samples(six from UTI cases and two from apparently healthy people,Candida(C.albicans 3,C.catenulata 1,C.krusei 1,C.tropicalis 1,C.parapsiplosis 1,C.gulliermondii 1)and Rhizopus species(1)were detected.Candida krusei was detected only in a single urine sample from a healthy person and C.albicans was detected both in urine of healthy and clinical UTI cases.Gram-positive(G+ve)bacteria were more commonly(Odds ratio,1.98;CI99,1.01-3.87)detected in urine samples of apparently healthy humans,and Gram-negative(G−ve)bacteria(Odds ratio,2.74;CI99,1.44-5.23)in urines of UTI cases.From urine samples of 161 UTI cases,a total of 90 different types of microbes were detected and,73 samples had only a single type of bacteria.In contrast,49,29,3,4,1,and 2 samples had 2,3,4,5,6 and 7 types of bacteria,respectively.The most common bacteria detected in urine of UTI cases was Escherichia coli(52 samples),in 20 cases as the single type of bacteria,other 34 types of bacteria were detected in pure form in 53 cases.From 128 urine samples of apparently healthy people,88 types of microbes were detected either singly or in association with others,from 64 urine samples only a single type of bacteria was detected while 34,13,3,11,2 and 1 sample yielded 2,3,4,5,6 and seven types of microbes,respectively.In the urine of apparently healthy humans too,E.coli was the most common bacteria,(10 samples)followed by Staphylococcus haemolyticus(9),S.intermedius(5),and S.aureus(5),and similar types of bacteria also dominated in cases of mixed occurrence,E.coli was detected in 26,S.aureus in 22 and S.haemolyticus in 19 urine samples,respectively.G+ve bacteria isolated from urine samples’irrespective of health status were more often(P<0.01)resistant than G−ve bacteria to ajowan oil,holy basil oil,cinnamaldehyde,and cinnamon oil,but more susceptible to sandalwood oil(P<0.01).However,for antibiotics,G+ve were more often susceptible than G−ve bacteria to cephalosporins,doxycycline,and nitrofurantoin.Conclusion:The study concludes that to understand the role of good and bad bacteria in the urinary tract microbiome more targeted studies are needed to discern the isolates at the pathotype level.Further,the study suggests the use of antibiotics by observing good antibiotic stewardship following antibiotic susceptibility testing only.展开更多
The gram-negative bacterium Helicobacter pylori(H.pylori)causes chronic gastritis,gastric and duodenal ulcers,gastric cancer and mucosa-associated lymphoid tissue lymphoma.Treatment is recommended in all symptomatic p...The gram-negative bacterium Helicobacter pylori(H.pylori)causes chronic gastritis,gastric and duodenal ulcers,gastric cancer and mucosa-associated lymphoid tissue lymphoma.Treatment is recommended in all symptomatic patients.The current treatment options for H.pylori infection are outlined in this review in light of the recent challenges in eradication success,largely due to the rapid emergence of antibiotic resistant strains of H.pylori.Antibiotic resistance is a constantly evolving process and numerous studies have shown that the prevalence of H.pylori antibiotic resistance varies significantly from country to country,and even between regions within the same country.In addition,recent data has shown that previous antibiotic use is associated with harbouring antibiotic resistant H.pylori.Local surveillance of antibiotic resistance is warranted to guide clinicians in their choice of therapy.Antimicrobial resistance is assessed by H.pylori culture and antimicrobial susceptibility testing.Recently developed molecular tests offer an attractive alternative to culture and allow for the rapid molecular genetic identification of H.pylori and resistance-associated mutations directly from biopsy samples or bacterial culture material.Accumulating evidence indicates that surveillance of antimicrobial resistance by susceptibility testing is feasible and necessary to inform clinicians in their choice of therapy for management of H.pylori infection.展开更多
The management of Helicobacter pylori(H. pylori) infection treatment differs from the common treatment protocol for other infectious diseases. Because culture-or molecular-guided approaches face several practical issu...The management of Helicobacter pylori(H. pylori) infection treatment differs from the common treatment protocol for other infectious diseases. Because culture-or molecular-guided approaches face several practical issues, such as the invasive procedures required to obtain gastric biopsy specimens and the lack of availability of routine laboratory testing in some places, H. pylori treatment includes the administration of two or three empirically selected antibiotics combined with a proton pump inhibitor rather than evidence-based eradication treatment. The efficacy of empirical therapy is decreasing, mostly due to increasing multiple resistance. Multiresistance to levofloxacin, clarithromycin, and metronidazole, which are commonly used in empirical treatments, appears to have increased in many countries. Mutations play a primary role in the antimicrobial resistance of H. pylori, but many different mechanisms can be involved in the development of antibiotic resistance. Determining and understanding these possible mechanisms might allow the development of new methods for the detection of H. pylori and the determination of antimicrobial resistance. A treatment based on the detection of antimicrobial resistance is usually more effective than empirical treatment. Nevertheless, such an approach before treatment is still not recommended in the Maastricht guidelines due to the difficulty associated with the routine application of available cultureor molecular-based susceptibility tests, which are usually administered in cases of treatment failure. The management of first and rescue treatments requires further research due to the steadily increase in antimicrobial resistance.展开更多
Objective: To investigate the prevalence of urinary tract infection among patients at Messalata Central Hospital, Libya, to identify the causative bacteria, and to explore their resistance pattern to antimicrobials. M...Objective: To investigate the prevalence of urinary tract infection among patients at Messalata Central Hospital, Libya, to identify the causative bacteria, and to explore their resistance pattern to antimicrobials. Methods: A total number of 1 153 urine samples were collected from patients, who attended daily to Messalata Central Hospital, Libya, in a study extended for one year. Antimicrobial susceptibility testing and isolates typing were done using Phoenix BD(BD diagnostic). Resistance was confirmed manually using agar disk diffusion method. Results: Of the 1 153 urine samples tested, 160(13.9%) samples were positive, from which 17 different, solely Gram negative, uropathogens were identified. Escherichia coli were the most prevalent(55.6%) bacteria, followed by Klebsiella pneumoniae subspecies pneumoniae(16.3%), Proteus mirabilis(6.3%), Pseudomonas aeruginosa(5.6%), Enterobacter cloacae and Klebsiella oxytoca(2.5%, each), Citrobacter koseri and Providencia rettgeri(1.9%, each), Acinetobacter baumannii, Enterobacter aerogenes and Proteus vulgaris(1.3%, each), and Aeromonas caviae, Citrobacter freundii, Cronobacter sakazakii, Enterobacter amnigenus biogroup 2, Pseudomonas putida and Serratia marcescens(0.6%, each). The isolated uropathogens showed increased levels of resistance ranged from 10.5% to 64.5%, with an overall resistance of 28.9%. Amikacin was the most effective antimicrobial followed by Imipenem and Meropenem(0%, 0.6% and 2.5% resistance, respectively); while, Cephalothin and Ampicillin were the least(80.6% and 90.0% resistance, respectively) effective. Conclusions: The obtained results emphasized the emergence of highly resistant bacteria to most of tested antimicrobials and raise the alarm for physicians to change their treatment pattern depending on antimicrobial susceptibility results.展开更多
A laboratory information system (LIS) established in a microbiology department has the potential to play an important role in the quality of microbiology data such as culture of blood, urine, stool, pus swab samples e...A laboratory information system (LIS) established in a microbiology department has the potential to play an important role in the quality of microbiology data such as culture of blood, urine, stool, pus swab samples etc. Such data could be effectively utilised to measure the burden of antimicrobial resistance among patients presented to various hospitals and clinics with an episode of an infectious illness of bacterial origin. A variety of clinical and epidemiological investigations are conducted using culture data and the presence of an electronic system such as LIS enhances such investigations and improves the reliability of measures of antimicrobial resistance owing to improved data quality as well as completeness of data gathered as opposed to paper based system. Therefore to improve surveillance of antimicrobial resistance in South Africa, there is a need to reinforce the functionality of the LIS in both public and private microbiology laboratories as this will help to improve internal quality control methodologies.展开更多
The distinction of antimicrobial resistance of clinical bacteria isolated from county hospitals and a teaching hospital was investigated. Disc diffusion test was used to study the antimicrobial resistance of isolates ...The distinction of antimicrobial resistance of clinical bacteria isolated from county hospitals and a teaching hospital was investigated. Disc diffusion test was used to study the antimicrobial resistance of isolates collected from county hospitals and a teaching hospital. The data was analyzed by WHONET5 and SPSS statistic software. A total of 655 strains and 1682 strains were collected from county hospitals and a teaching hospital, respectively, in the year of 2003. The top ten pathogens were Coagulase negative staphylococci (CNS), E. coil, Klebsiella spp. , S. areus, P. aeruginosa, Enterococcus spp. , Enterobacter spp. , otherwise Salmonella spp. , Proteus spp. , Shigella spp. in county hospitals and Streptococcus spp. , Acinetobacter spp. , X. maltophilia in the teaching hospital. The prevalence of multi-drug resistant bacteria was 5 % (4/86) of methicillin-resistant S. areus (MRSA), 12 % (16/133) and 15.8 % (9/57) of extended-spectrum β-lactamases producing strains of E. coil and Klebsiella spp. , respectively, in county hospitals. All of the three rates were lower than that in the teaching hospital and the difference was statistically significant (P〈0. 01). However, the incidence of methicillin-resistant CNS (MRCNS) reached to 70 % (109/156) in the two classes of hospitals. Generally, the antimicrobial resistant rates in the county hospitals were lower than those in the teaching hospital, except the resistant rates of ciprofloxacin, erythromycin, clindamycin, SMZco which were similar in the two classes of hospitals. There were differences between county hospitals and the teaching hospital in the distribution of clinical isolates and prevalence of antimicrobial resistance. It was the basis of rational use of antimicrobial agents to monitor antimicrobial resistance by each hospital.展开更多
Antimicrobial use in agriculture, livestock and human health has increased over the years leading to the increase in antimicrobial resistance that can also find its way to the aquatic environment. Rivers can act as re...Antimicrobial use in agriculture, livestock and human health has increased over the years leading to the increase in antimicrobial resistance that can also find its way to the aquatic environment. Rivers can act as reservoirs of highly resistant strains and facilitate the dissemination of multidrug resistant (MDR) strains to animals and humans using water. A total of 318 water samples were collected from six different sampling points along Athi River and E. coli isolates were subjected to Kirby-Bauer diffusion method for antimicrobial susceptibility testing. The total mean coliform count of the sampled sites was 2.7 × 104 (cfu/mL). E. coli isolates were most resistant to ampicillin (63.8%) and most susceptible to gentamicin (99.4%). MDR strains (resistance to ≥3 classes of antibiotics) accounted for 65.4% of all the isolates. The site recorded to have human industrial and agricultural zone activities had strains that were significantly more resistant to ampicillin, cefoxitin, amoxicillin/clavulanic acid (P ≤ 0.05) than isolates from the section of the river traversing virgin land and land with minimum human activities. This study indicates that E. coli strains isolated from Athi River were highly MDR and most resistant to some antimicrobial classes (ampicillin and cefoxitin) which constitute a potential risk to human and animal health.展开更多
BACKGROUND With the widespread use of antimicrobial drugs,bacterial resistance has become a significant problem,posing a serious threat to public health.The prevalence of clinical infection strains in hospitals and th...BACKGROUND With the widespread use of antimicrobial drugs,bacterial resistance has become a significant problem,posing a serious threat to public health.The prevalence of clinical infection strains in hospitals and their drug sensitivities are key to the appropriate use of antibiotics in clinical practice.AIM To identify prevalent bacteria and their antibiotic resistance profiles in a hospital setting,thereby guiding effective antibiotic usage by clinicians.METHODS Specimens from across the institution were collected by the microbiology laboratory.The VITEK 2 compact fully automatic analyzer was used for bacterial identification and antibiotic sensitivity testing,and the WHONET5.6 software was utilized for statistical analysis.RESULTS A total of 12062 bacterial strains of key monitoring significance were detected.Staphylococcus aureus demonstrated widespread resistance to penicillin,but none of the strains were resistant to vancomycin or linezolid.Moreover,219 strains of methicillin-resistant coagulase-negative staphylococci and 110 strains of methicillin-resistant Staphylococcus aureus were detected.Enterococcus faecalis showed moderate resistance to the third-generation quinolones ciprofloxacin and levofloxacin,but its resistance to nitrofurantoin and tetracycline was low.Enterococcus faecium displayed significantly lower resistance to third-and fourthgeneration quinolones than Enterococcus faecalis.The resistance of two key monitoring strains,Escherichia coli and Klebsiella pneumoniae,to piperacillin/tazobactam was 5%-8%.However,none of the Escherichia coli and Klebsiella pneumoniae strains were resistant to meropenem.The resistance of Acinetobacter baumannii to piperacillin/sulbactam was nearly 90%.Nonetheless,the resistance to tigecycline was low,and Pseudomonas aeruginosa demonstrated minimal resistance in the antibiotic sensitivity test,maintaining a resistance of<10%to the cephalosporin antibiotics cefotetan and cefoperazone over the last 6 years.The resistance to amikacin remained at 0.2%over the past 3 years.CONCLUSION Our hospital’s overall antibiotic resistance rate was relatively stable from 2017 to 2022.The detection rates of key monitoring strains are reported quarterly and their resistance dynamics are monitored and communicated to the entire hospital,which can guide clinical antibiotic selection.展开更多
为确定黑龙江省某养殖场因呼吸道症状急性死亡病猪的致病菌,并探究其主要生物学特性,本研究采集病死猪内脏组织,通过细菌分离、革兰氏染色、生化鉴定、16S r RNA基因的PCR扩增、测序、系统进化树的构建对分离菌进行种属鉴定;通过微量肉...为确定黑龙江省某养殖场因呼吸道症状急性死亡病猪的致病菌,并探究其主要生物学特性,本研究采集病死猪内脏组织,通过细菌分离、革兰氏染色、生化鉴定、16S r RNA基因的PCR扩增、测序、系统进化树的构建对分离菌进行种属鉴定;通过微量肉汤稀释法分析该菌对8类10种抗生素的敏感性;通过Illumina PE150对细菌全基因组测序,采用ResFinder软件分析分离菌的耐药基因,并分析耐药基因与耐药表型的相关性。利用VFanalyzer软件、BLASTN比对分离菌的毒力基因。结果显示,该菌株在10%脱纤维羊血平板培养基上培养24 h后形成表面光滑具有β-溶血环的单菌落;革兰氏染色结果显示呈蓝紫色短棒状杆菌;生化鉴定结果显示该分离菌的生化特性与化脓隐秘杆菌符合。16S r RNA基因的PCR结果显示,扩增到1397 bp的目的基因序列,与GenBank中序列比对结果显示该菌株与已报道的化脓隐秘杆菌同源性高达99%。16S r RNA基因系统进化树分析结果显示分离菌与辽宁沈阳的牛源化脓隐秘杆株TZQ 01株处于同一分支,与日本的猪源分离株NIAH13531处于较近分支,以上结果可确定该分离菌为化脓隐秘杆菌,并将其命名为FY-4-Z-1。药敏试验结果显示,该菌株对头孢菌素类的头孢噻呋,青霉素类的青霉素、阿莫西林,大环内酯类的红霉素,截短侧耳素类的泰妙菌素等抗生素敏感,对四环素类的四环素,氨基糖苷类的链霉素耐药。利用组装软件SPAdes对获得的全基因组测序数据组装后获得了分离菌全基因组草图,结果显示分离菌基因组大小为2399.961 kb;耐药基因分析结果显示,该菌株基因组包含3种耐药基因,分别是氨基糖苷类的ant(6)-la、大环内脂类的erm(X)、四环素类的tet(W)耐药基因,其中在化脓隐秘杆菌中首次检测到ant(6)-la基因。该菌株对四环素和链霉素的药敏试验结果与其耐药基因检测结果相符,而红霉素敏感表型可能与其耐药基因erm(X)的移码突变有关。利用BLASTN和VFanalyzer软件进行毒力基因检测,结果显示共检测到8个已知毒力基因和24个候选毒力相关基因。本实验进一步丰富了猪源化脓隐秘杆菌的相关研究,为规模化猪场化脓隐秘杆菌病的防治提供了重要的参考依据和用药指导。展开更多
为调查河北地区鸡源沙门菌及其血清型的流行及分布情况,并分析其的致病性,本研究于2018年~2021年在河北省7个地区34个养鸡场共收集631份发病鸡肛拭子和62份病料样品共计693份,分别接种普通琼脂培养基分离细菌并纯化后经革兰氏染色镜检;...为调查河北地区鸡源沙门菌及其血清型的流行及分布情况,并分析其的致病性,本研究于2018年~2021年在河北省7个地区34个养鸡场共收集631份发病鸡肛拭子和62份病料样品共计693份,分别接种普通琼脂培养基分离细菌并纯化后经革兰氏染色镜检;将分离菌分别接种不同的培养基培养,并对分离菌经生化及16S r RNA基因的PCR及测序鉴定,随机选择32条测序序列经NCBI的BLAST比对,并采用DNAStar软件分析该基因的同源性。采用玻片凝集法鉴定分离菌的血清群及血清型并统计各血清群与血清型在河北不同地区的分布。结果显示,从693份病料样品中共分离到238株沙门菌,除3株未定群外,其余分离菌分属于A、B、C、D、E、F 6个血清群,其中D群最多达69.7%(166/238);238株沙门菌分属于7个不同的血清型和未定型,依次为鸡白痢沙门菌(91/38.2%)、甲型副伤寒沙门菌(43/18.0%)、鸡伤寒沙门菌(40/16.8%)、肠炎沙门菌(39/16.4%)等。血清群与血清型分布的统计结果显示,除张家口地区流行A群血清群外,其余地区流行的血清群均为D群;张家口地区流行鸡白痢沙门菌;秦皇岛地区有14种血清型,其中甲型副伤寒沙门菌为其流行血清型;石家庄、承德、唐山流行的均为鸡白痢沙门菌,邢台及保定地区分别流行肠炎沙门菌与鸡伤寒沙门菌。通过K-B药敏纸片法检测238株分离菌对7类共22种药物的敏感性;采用PCR检测分离菌的相关耐药基因并采用SPSS26.0软件中的Fisher确切概率法分析分离菌耐药表型与耐药基因之间的相关性。选取12株不同血清型的分离菌以0.2 m L/只(3×108cfu/mL)感染雏鸡,分析各分离菌对雏鸡的致病性。药敏试验结果显示,对苯唑西林、红霉素、青霉素、甲氧苄啶、氨苄西林、四环素耐药的菌株分别占97.5(232/238)、89.1%(212/238)、78.6%(187/238)、74.8%(178/238)、74.4%(177/238)、64.3%(153/238),对其它药物耐药的菌株均在32%以下,但均对头孢类药物敏感;且分离菌多呈多重耐药性(58.4%,139/238),耐6重药物的菌株(32.8%,78/238)与耐5重药物的菌株(11.8%,28/238)最多。耐药基因检测结果显示,对β-内酰胺类、磺胺类、大环内酯类、四环素类、氨基糖苷类药物的耐药基因tem、erm(B)a、tetA、strA-B的检出率分别为100%(238/238)、75.2%(178/238)、71%(169/238)、65.6%(156/238)及31.9%(76/238)。未检测到喹诺酮类和醛胺醇类耐药基因。经分析,氨基糖苷类、四环素类、磺胺类、β-内酰胺类、大环内酯类药物的耐药表型与其耐药基因的符合率分别为94.7%、98.1%、99.4%、97.5%、79.9%,相关性均较强。致病性试验结果显示,12株分离菌均能致感染鸡出现不同的临床症状及肝脏和肠道的剖检病变,且能对鸡造成不同程度的死亡,其中以致鸡死亡10只(100%)、7只(87%)为主,并从死亡鸡的肝脏再次分离到相应细菌。上述结果表明,本研究从河北不同地区分离的238株沙门菌血清群与血清型众多,大多数沙门菌的耐药性较强且多呈多重耐药性,其携带的5类药物的耐药基因与其相对应的耐药表型均呈较强的相关性,且分离菌对雏鸡呈不同的致病性。本研究为河北地区鸡源沙门菌的流行病学调查及其感染的防治提供参考依据。展开更多
基金supported by grants received from CAAST-ACLH(NAHEP/CAAST/2018-19)of ICAR-World Bank-funded National Agricultural Higher Education Project(NAHEP).
文摘Background:The uroculturome indicates the profile of culturable microbes inhabiting the urinary tract,and it is often required to do a urine culture to find an effective antimicrobial to treat urinary tract infections(UTIs).Methods:This study targeted to understand the profile of culturable pathogens in the urine of apparently healthy(128)and humans with clinical UTIs(161)and their antimicrobial susceptibility.All the urine samples were analyzed to quantify microbial load and determine the diversity and antimicrobial susceptibility of microbes following standard microbiological methods.Results:In urine samples from UTI cases,microbial counts were 1.2×10^(4)±6.02×10^(3) colony-forming units(cfu)/mL,while in urine samples from apparently healthy humans,the average count was 3.33±1.34×10^(3) cfu/mL.In eight samples(six from UTI cases and two from apparently healthy people,Candida(C.albicans 3,C.catenulata 1,C.krusei 1,C.tropicalis 1,C.parapsiplosis 1,C.gulliermondii 1)and Rhizopus species(1)were detected.Candida krusei was detected only in a single urine sample from a healthy person and C.albicans was detected both in urine of healthy and clinical UTI cases.Gram-positive(G+ve)bacteria were more commonly(Odds ratio,1.98;CI99,1.01-3.87)detected in urine samples of apparently healthy humans,and Gram-negative(G−ve)bacteria(Odds ratio,2.74;CI99,1.44-5.23)in urines of UTI cases.From urine samples of 161 UTI cases,a total of 90 different types of microbes were detected and,73 samples had only a single type of bacteria.In contrast,49,29,3,4,1,and 2 samples had 2,3,4,5,6 and 7 types of bacteria,respectively.The most common bacteria detected in urine of UTI cases was Escherichia coli(52 samples),in 20 cases as the single type of bacteria,other 34 types of bacteria were detected in pure form in 53 cases.From 128 urine samples of apparently healthy people,88 types of microbes were detected either singly or in association with others,from 64 urine samples only a single type of bacteria was detected while 34,13,3,11,2 and 1 sample yielded 2,3,4,5,6 and seven types of microbes,respectively.In the urine of apparently healthy humans too,E.coli was the most common bacteria,(10 samples)followed by Staphylococcus haemolyticus(9),S.intermedius(5),and S.aureus(5),and similar types of bacteria also dominated in cases of mixed occurrence,E.coli was detected in 26,S.aureus in 22 and S.haemolyticus in 19 urine samples,respectively.G+ve bacteria isolated from urine samples’irrespective of health status were more often(P<0.01)resistant than G−ve bacteria to ajowan oil,holy basil oil,cinnamaldehyde,and cinnamon oil,but more susceptible to sandalwood oil(P<0.01).However,for antibiotics,G+ve were more often susceptible than G−ve bacteria to cephalosporins,doxycycline,and nitrofurantoin.Conclusion:The study concludes that to understand the role of good and bad bacteria in the urinary tract microbiome more targeted studies are needed to discern the isolates at the pathotype level.Further,the study suggests the use of antibiotics by observing good antibiotic stewardship following antibiotic susceptibility testing only.
文摘The gram-negative bacterium Helicobacter pylori(H.pylori)causes chronic gastritis,gastric and duodenal ulcers,gastric cancer and mucosa-associated lymphoid tissue lymphoma.Treatment is recommended in all symptomatic patients.The current treatment options for H.pylori infection are outlined in this review in light of the recent challenges in eradication success,largely due to the rapid emergence of antibiotic resistant strains of H.pylori.Antibiotic resistance is a constantly evolving process and numerous studies have shown that the prevalence of H.pylori antibiotic resistance varies significantly from country to country,and even between regions within the same country.In addition,recent data has shown that previous antibiotic use is associated with harbouring antibiotic resistant H.pylori.Local surveillance of antibiotic resistance is warranted to guide clinicians in their choice of therapy.Antimicrobial resistance is assessed by H.pylori culture and antimicrobial susceptibility testing.Recently developed molecular tests offer an attractive alternative to culture and allow for the rapid molecular genetic identification of H.pylori and resistance-associated mutations directly from biopsy samples or bacterial culture material.Accumulating evidence indicates that surveillance of antimicrobial resistance by susceptibility testing is feasible and necessary to inform clinicians in their choice of therapy for management of H.pylori infection.
文摘The management of Helicobacter pylori(H. pylori) infection treatment differs from the common treatment protocol for other infectious diseases. Because culture-or molecular-guided approaches face several practical issues, such as the invasive procedures required to obtain gastric biopsy specimens and the lack of availability of routine laboratory testing in some places, H. pylori treatment includes the administration of two or three empirically selected antibiotics combined with a proton pump inhibitor rather than evidence-based eradication treatment. The efficacy of empirical therapy is decreasing, mostly due to increasing multiple resistance. Multiresistance to levofloxacin, clarithromycin, and metronidazole, which are commonly used in empirical treatments, appears to have increased in many countries. Mutations play a primary role in the antimicrobial resistance of H. pylori, but many different mechanisms can be involved in the development of antibiotic resistance. Determining and understanding these possible mechanisms might allow the development of new methods for the detection of H. pylori and the determination of antimicrobial resistance. A treatment based on the detection of antimicrobial resistance is usually more effective than empirical treatment. Nevertheless, such an approach before treatment is still not recommended in the Maastricht guidelines due to the difficulty associated with the routine application of available cultureor molecular-based susceptibility tests, which are usually administered in cases of treatment failure. The management of first and rescue treatments requires further research due to the steadily increase in antimicrobial resistance.
文摘Objective: To investigate the prevalence of urinary tract infection among patients at Messalata Central Hospital, Libya, to identify the causative bacteria, and to explore their resistance pattern to antimicrobials. Methods: A total number of 1 153 urine samples were collected from patients, who attended daily to Messalata Central Hospital, Libya, in a study extended for one year. Antimicrobial susceptibility testing and isolates typing were done using Phoenix BD(BD diagnostic). Resistance was confirmed manually using agar disk diffusion method. Results: Of the 1 153 urine samples tested, 160(13.9%) samples were positive, from which 17 different, solely Gram negative, uropathogens were identified. Escherichia coli were the most prevalent(55.6%) bacteria, followed by Klebsiella pneumoniae subspecies pneumoniae(16.3%), Proteus mirabilis(6.3%), Pseudomonas aeruginosa(5.6%), Enterobacter cloacae and Klebsiella oxytoca(2.5%, each), Citrobacter koseri and Providencia rettgeri(1.9%, each), Acinetobacter baumannii, Enterobacter aerogenes and Proteus vulgaris(1.3%, each), and Aeromonas caviae, Citrobacter freundii, Cronobacter sakazakii, Enterobacter amnigenus biogroup 2, Pseudomonas putida and Serratia marcescens(0.6%, each). The isolated uropathogens showed increased levels of resistance ranged from 10.5% to 64.5%, with an overall resistance of 28.9%. Amikacin was the most effective antimicrobial followed by Imipenem and Meropenem(0%, 0.6% and 2.5% resistance, respectively); while, Cephalothin and Ampicillin were the least(80.6% and 90.0% resistance, respectively) effective. Conclusions: The obtained results emphasized the emergence of highly resistant bacteria to most of tested antimicrobials and raise the alarm for physicians to change their treatment pattern depending on antimicrobial susceptibility results.
文摘A laboratory information system (LIS) established in a microbiology department has the potential to play an important role in the quality of microbiology data such as culture of blood, urine, stool, pus swab samples etc. Such data could be effectively utilised to measure the burden of antimicrobial resistance among patients presented to various hospitals and clinics with an episode of an infectious illness of bacterial origin. A variety of clinical and epidemiological investigations are conducted using culture data and the presence of an electronic system such as LIS enhances such investigations and improves the reliability of measures of antimicrobial resistance owing to improved data quality as well as completeness of data gathered as opposed to paper based system. Therefore to improve surveillance of antimicrobial resistance in South Africa, there is a need to reinforce the functionality of the LIS in both public and private microbiology laboratories as this will help to improve internal quality control methodologies.
文摘The distinction of antimicrobial resistance of clinical bacteria isolated from county hospitals and a teaching hospital was investigated. Disc diffusion test was used to study the antimicrobial resistance of isolates collected from county hospitals and a teaching hospital. The data was analyzed by WHONET5 and SPSS statistic software. A total of 655 strains and 1682 strains were collected from county hospitals and a teaching hospital, respectively, in the year of 2003. The top ten pathogens were Coagulase negative staphylococci (CNS), E. coil, Klebsiella spp. , S. areus, P. aeruginosa, Enterococcus spp. , Enterobacter spp. , otherwise Salmonella spp. , Proteus spp. , Shigella spp. in county hospitals and Streptococcus spp. , Acinetobacter spp. , X. maltophilia in the teaching hospital. The prevalence of multi-drug resistant bacteria was 5 % (4/86) of methicillin-resistant S. areus (MRSA), 12 % (16/133) and 15.8 % (9/57) of extended-spectrum β-lactamases producing strains of E. coil and Klebsiella spp. , respectively, in county hospitals. All of the three rates were lower than that in the teaching hospital and the difference was statistically significant (P〈0. 01). However, the incidence of methicillin-resistant CNS (MRCNS) reached to 70 % (109/156) in the two classes of hospitals. Generally, the antimicrobial resistant rates in the county hospitals were lower than those in the teaching hospital, except the resistant rates of ciprofloxacin, erythromycin, clindamycin, SMZco which were similar in the two classes of hospitals. There were differences between county hospitals and the teaching hospital in the distribution of clinical isolates and prevalence of antimicrobial resistance. It was the basis of rational use of antimicrobial agents to monitor antimicrobial resistance by each hospital.
文摘Antimicrobial use in agriculture, livestock and human health has increased over the years leading to the increase in antimicrobial resistance that can also find its way to the aquatic environment. Rivers can act as reservoirs of highly resistant strains and facilitate the dissemination of multidrug resistant (MDR) strains to animals and humans using water. A total of 318 water samples were collected from six different sampling points along Athi River and E. coli isolates were subjected to Kirby-Bauer diffusion method for antimicrobial susceptibility testing. The total mean coliform count of the sampled sites was 2.7 × 104 (cfu/mL). E. coli isolates were most resistant to ampicillin (63.8%) and most susceptible to gentamicin (99.4%). MDR strains (resistance to ≥3 classes of antibiotics) accounted for 65.4% of all the isolates. The site recorded to have human industrial and agricultural zone activities had strains that were significantly more resistant to ampicillin, cefoxitin, amoxicillin/clavulanic acid (P ≤ 0.05) than isolates from the section of the river traversing virgin land and land with minimum human activities. This study indicates that E. coli strains isolated from Athi River were highly MDR and most resistant to some antimicrobial classes (ampicillin and cefoxitin) which constitute a potential risk to human and animal health.
文摘BACKGROUND With the widespread use of antimicrobial drugs,bacterial resistance has become a significant problem,posing a serious threat to public health.The prevalence of clinical infection strains in hospitals and their drug sensitivities are key to the appropriate use of antibiotics in clinical practice.AIM To identify prevalent bacteria and their antibiotic resistance profiles in a hospital setting,thereby guiding effective antibiotic usage by clinicians.METHODS Specimens from across the institution were collected by the microbiology laboratory.The VITEK 2 compact fully automatic analyzer was used for bacterial identification and antibiotic sensitivity testing,and the WHONET5.6 software was utilized for statistical analysis.RESULTS A total of 12062 bacterial strains of key monitoring significance were detected.Staphylococcus aureus demonstrated widespread resistance to penicillin,but none of the strains were resistant to vancomycin or linezolid.Moreover,219 strains of methicillin-resistant coagulase-negative staphylococci and 110 strains of methicillin-resistant Staphylococcus aureus were detected.Enterococcus faecalis showed moderate resistance to the third-generation quinolones ciprofloxacin and levofloxacin,but its resistance to nitrofurantoin and tetracycline was low.Enterococcus faecium displayed significantly lower resistance to third-and fourthgeneration quinolones than Enterococcus faecalis.The resistance of two key monitoring strains,Escherichia coli and Klebsiella pneumoniae,to piperacillin/tazobactam was 5%-8%.However,none of the Escherichia coli and Klebsiella pneumoniae strains were resistant to meropenem.The resistance of Acinetobacter baumannii to piperacillin/sulbactam was nearly 90%.Nonetheless,the resistance to tigecycline was low,and Pseudomonas aeruginosa demonstrated minimal resistance in the antibiotic sensitivity test,maintaining a resistance of<10%to the cephalosporin antibiotics cefotetan and cefoperazone over the last 6 years.The resistance to amikacin remained at 0.2%over the past 3 years.CONCLUSION Our hospital’s overall antibiotic resistance rate was relatively stable from 2017 to 2022.The detection rates of key monitoring strains are reported quarterly and their resistance dynamics are monitored and communicated to the entire hospital,which can guide clinical antibiotic selection.
文摘为确定黑龙江省某养殖场因呼吸道症状急性死亡病猪的致病菌,并探究其主要生物学特性,本研究采集病死猪内脏组织,通过细菌分离、革兰氏染色、生化鉴定、16S r RNA基因的PCR扩增、测序、系统进化树的构建对分离菌进行种属鉴定;通过微量肉汤稀释法分析该菌对8类10种抗生素的敏感性;通过Illumina PE150对细菌全基因组测序,采用ResFinder软件分析分离菌的耐药基因,并分析耐药基因与耐药表型的相关性。利用VFanalyzer软件、BLASTN比对分离菌的毒力基因。结果显示,该菌株在10%脱纤维羊血平板培养基上培养24 h后形成表面光滑具有β-溶血环的单菌落;革兰氏染色结果显示呈蓝紫色短棒状杆菌;生化鉴定结果显示该分离菌的生化特性与化脓隐秘杆菌符合。16S r RNA基因的PCR结果显示,扩增到1397 bp的目的基因序列,与GenBank中序列比对结果显示该菌株与已报道的化脓隐秘杆菌同源性高达99%。16S r RNA基因系统进化树分析结果显示分离菌与辽宁沈阳的牛源化脓隐秘杆株TZQ 01株处于同一分支,与日本的猪源分离株NIAH13531处于较近分支,以上结果可确定该分离菌为化脓隐秘杆菌,并将其命名为FY-4-Z-1。药敏试验结果显示,该菌株对头孢菌素类的头孢噻呋,青霉素类的青霉素、阿莫西林,大环内酯类的红霉素,截短侧耳素类的泰妙菌素等抗生素敏感,对四环素类的四环素,氨基糖苷类的链霉素耐药。利用组装软件SPAdes对获得的全基因组测序数据组装后获得了分离菌全基因组草图,结果显示分离菌基因组大小为2399.961 kb;耐药基因分析结果显示,该菌株基因组包含3种耐药基因,分别是氨基糖苷类的ant(6)-la、大环内脂类的erm(X)、四环素类的tet(W)耐药基因,其中在化脓隐秘杆菌中首次检测到ant(6)-la基因。该菌株对四环素和链霉素的药敏试验结果与其耐药基因检测结果相符,而红霉素敏感表型可能与其耐药基因erm(X)的移码突变有关。利用BLASTN和VFanalyzer软件进行毒力基因检测,结果显示共检测到8个已知毒力基因和24个候选毒力相关基因。本实验进一步丰富了猪源化脓隐秘杆菌的相关研究,为规模化猪场化脓隐秘杆菌病的防治提供了重要的参考依据和用药指导。
文摘为调查河北地区鸡源沙门菌及其血清型的流行及分布情况,并分析其的致病性,本研究于2018年~2021年在河北省7个地区34个养鸡场共收集631份发病鸡肛拭子和62份病料样品共计693份,分别接种普通琼脂培养基分离细菌并纯化后经革兰氏染色镜检;将分离菌分别接种不同的培养基培养,并对分离菌经生化及16S r RNA基因的PCR及测序鉴定,随机选择32条测序序列经NCBI的BLAST比对,并采用DNAStar软件分析该基因的同源性。采用玻片凝集法鉴定分离菌的血清群及血清型并统计各血清群与血清型在河北不同地区的分布。结果显示,从693份病料样品中共分离到238株沙门菌,除3株未定群外,其余分离菌分属于A、B、C、D、E、F 6个血清群,其中D群最多达69.7%(166/238);238株沙门菌分属于7个不同的血清型和未定型,依次为鸡白痢沙门菌(91/38.2%)、甲型副伤寒沙门菌(43/18.0%)、鸡伤寒沙门菌(40/16.8%)、肠炎沙门菌(39/16.4%)等。血清群与血清型分布的统计结果显示,除张家口地区流行A群血清群外,其余地区流行的血清群均为D群;张家口地区流行鸡白痢沙门菌;秦皇岛地区有14种血清型,其中甲型副伤寒沙门菌为其流行血清型;石家庄、承德、唐山流行的均为鸡白痢沙门菌,邢台及保定地区分别流行肠炎沙门菌与鸡伤寒沙门菌。通过K-B药敏纸片法检测238株分离菌对7类共22种药物的敏感性;采用PCR检测分离菌的相关耐药基因并采用SPSS26.0软件中的Fisher确切概率法分析分离菌耐药表型与耐药基因之间的相关性。选取12株不同血清型的分离菌以0.2 m L/只(3×108cfu/mL)感染雏鸡,分析各分离菌对雏鸡的致病性。药敏试验结果显示,对苯唑西林、红霉素、青霉素、甲氧苄啶、氨苄西林、四环素耐药的菌株分别占97.5(232/238)、89.1%(212/238)、78.6%(187/238)、74.8%(178/238)、74.4%(177/238)、64.3%(153/238),对其它药物耐药的菌株均在32%以下,但均对头孢类药物敏感;且分离菌多呈多重耐药性(58.4%,139/238),耐6重药物的菌株(32.8%,78/238)与耐5重药物的菌株(11.8%,28/238)最多。耐药基因检测结果显示,对β-内酰胺类、磺胺类、大环内酯类、四环素类、氨基糖苷类药物的耐药基因tem、erm(B)a、tetA、strA-B的检出率分别为100%(238/238)、75.2%(178/238)、71%(169/238)、65.6%(156/238)及31.9%(76/238)。未检测到喹诺酮类和醛胺醇类耐药基因。经分析,氨基糖苷类、四环素类、磺胺类、β-内酰胺类、大环内酯类药物的耐药表型与其耐药基因的符合率分别为94.7%、98.1%、99.4%、97.5%、79.9%,相关性均较强。致病性试验结果显示,12株分离菌均能致感染鸡出现不同的临床症状及肝脏和肠道的剖检病变,且能对鸡造成不同程度的死亡,其中以致鸡死亡10只(100%)、7只(87%)为主,并从死亡鸡的肝脏再次分离到相应细菌。上述结果表明,本研究从河北不同地区分离的238株沙门菌血清群与血清型众多,大多数沙门菌的耐药性较强且多呈多重耐药性,其携带的5类药物的耐药基因与其相对应的耐药表型均呈较强的相关性,且分离菌对雏鸡呈不同的致病性。本研究为河北地区鸡源沙门菌的流行病学调查及其感染的防治提供参考依据。