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| 1 | Cholera Caused by a New Clone of Serogroup O1 Vibrio cholerae-Beijing Municipality,China,June 2021显示文摘Several lineages have been identified in the population of serogroup O1 Vibrio cholerae(V.cholerae)(1-3).The strains,which were responsible for the ongoing seventh cholera pandemic,were in Lineage 2.Nearly all the V.cholerae strains in this lineage carried genes coding cholera toxin(ctxAB)(1-2).Lineage 3b consists of strains isolated from different continents and the vast majority of strains in this lineage lack the ctxAB genes. | Hanqiu Yan Bo Pang Xin Lu Zhiyong Gao Pan Lu Xin Zhang Mengyu Wang Lingyu Shen Wenxuan Zhao Jianhong Zhao Weili Liang Lei Jia Haijian Zhou Zhigang Cui Xiaoli Du Biao Kan Quanyi Wang | 2022 | China CDC weekly2022，4，2： | 3 |
| 2 | Vibrio parahaemolyticus O10:K4:An Emergent Serotype with Pandemic Virulence Traits as Predominant Clone Detected by Whole-Genome Sequence Analysis--Beijing Municipality,China,2021显示文摘Introduction:Vibrio parahaemolyticus(V.parahaemolyticus)is a common foodborne pathogen which causes gastroenteritis in humans,especially the O3:K6 pandemic clone which is still a prominent serotype in Beijing,China.In this study,we observed a novel serotype O10:K4 isolated from clinical diarrhea cases,which became the most prevalent clone in 2021.Methods:73 clinical isolates were collected through sentinel hospitals’surveillance in 2021.Serum agglutination testing and antimicrobial susceptibility testing were conducted.Whole genome sequencing was applied to characterize 73 V.parahaemolyticus strains and complete phylogenetic analysis.Results:Seven serotypes were identified among 73 strains.O10:K4 was the most common serotype(83.6%),followed by O2:KUT,O4:KUT,and O1:KUT.Multilocus sequence typing divided the 73 isolates into 10 sequence types(STs)with ST3 as the most prevalent,which covered all O10:K4 strains.Most isolates were sensitive to common antimicrobial agents apart from colistin.All the O10:K4 isolates were positive for the thermostable direct hemolysin gene,toxRS/new,and orf8,and negative for the TDH-related hemolysin gene.The whole genome sequencing-single nucleotide polymorphism phylogenetic analysis revealed O10:K4 strains formed a main genetic lineage,which was genetically distinct from other serotypes.We also demonstrated the presence of two type III secretion system genes(T3SS1 and T3SS2)andβlactamase resistance gene blaCARB-22 in all O10:K4 strains.Conclusions:The study confirmed the emergence of V.parahaemolyticus O10:K4 possessing virulence factors similar to the O3:K6 pandemic clone,which may have enabled them to become prevalent in Beijing,China. | Ying Huang Bing Lyu Xin Zhang Yi Tian Changying Lin Lingyu Shen Hanqiu Yan Daitao Zhang Lei Jia Mei Qu Quanyi Wang | 2022 | China CDC weekly2022，4，22： | 2 |
| 3 | Genomic Analysis and Antimicrobial Resistance of Campylobacter jejuni Isolated from Diarrheal Patients—Beijing Municipality,China,2019–2021显示文摘Introduction:Campylobacter jejuni(C.jejuni)is the leading cause of human bacterial gastroenteritis worldwide and has a major impact on global public health.The objective of the present study was to conduct whole genome sequencing(WGS)to determine the genetic diversity,virulence factors,and determinants of antimicrobial resistance of C.jejuni during a 3-year surveillance period in Beijing,China.Methods:A total of 184 clinical isolates were obtained from sentinel hospital surveillance between 2019 and 2021.Antimicrobial susceptibility testing was conducted using the agar dilution method.WGS was employed to characterize the 184 C.jejuni strains.Results:Multilocus sequence typing analysis revealed high genetic diversity among the 184 C.jejuni strains,identifying 71 sequence types(STs)and 19 clonal complexes(CCs).The most prevalent ST was ST760(6.5%),and the most common CC was CC21(24.5%),consisting of 11 STs.High resistance rates were observed for ciprofloxacin(76.6%),nalidixic acid(76.1%),and tetracycline(71.2%).A total of 77 C.jejuni isolates(41.8%)exhibited multidrug resistance with 43 resistance patterns.Virulome analysis disclosed the differential distribution of virulence factors related to adherence,colonization,chemotaxis,as well as lipooligosaccharide and capsular polysaccharide biosynthesis.Resistome analysis demonstrated widespread resistance to quinolones and tetracycline,but low rates of macrolides resistance.The phylogeny,based on whole genome single nucleotide polymorphisms,indicated a high degree of clonality and grouped the C.jejuni strains into six clades.Closely related isolates that were part of a genetic cluster mostly shared a homogenous clonal complex.Conclusions:The present study emphasizes the rising resistance to quinolones and tetracycline,as well as the virulence potential and diverse genotypes identified among C.jejuni strains isolated from diarrheal patients in Beijing. | Daitao Zhang Xin Zhang Bing Lyu Yi Tian Ying Huang Changying Lin Hanqiu Yan Lei Jia Mei Qu Quanyi Wang | 2023 | China CDC weekly2023，5，19： | 0 |
| 4 | Asymptomatic Norovirus Infection Among Children in Kindergartens and Primary Schools—Beijing Municipality,China,2021显示文摘Summary What is already known about this topic?Children in kindergartens and primary schools are the high-incidence groups of norovirus acute gastroenteritis.However,asymptomatic norovirus infection among them is seldom reported.What is added by this report?The norovirus positive rate was 3.48% among asymptomatic children in kindergartens and primary schools in Beijing Municipality in June 2021,the most common genotype was GII.4 Sydney,and no acute gastroenteritis outbreak was reported over the study period. | Qingrui Wu Xiuxia Wei Jianjun Zhang Zhenjiang Xin Xiaoxing Yang Ling Zhang Meng Qin Xiaogen Dong Hanqiu Yan Zhiyong Gao | 2023 | China CDC weekly2023，5，8： | 0 |
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