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J Med Microbiol 56 (2007), 1224-1229; DOI: 10.1099/jmm.0.47263-0
© 2007 Society for General Microbiology
ISSN 1473-5644

Molecular characterization of serogroup C Neisseria meningitidis isolated in China

Xiaobing Zhang1,{dagger}, Zhujun Shao2,{dagger}, E Yang1, Li Xu2, Xingye Xu1, Machao Li2, Jun Ren3, Yafang Zhu1, Fan Yang1, Xiaofeng Liang4, Leonard W. Mayer5, Jianguo Xu2 and Qi Jin1

1 State Key Laboratory for Molecular Virology and Genetic Engineering, National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 100176, PR China

2 State Key Laboratory for Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, PR China

3 Anhui Provincial Center for Disease Control and Prevention, Hefei 230000, PR China

4 Chinese Center for Disease Control and Prevention, 27 Nan Wei Road, Beijing 100050, PR China

5 Meningitis and Vaccine Preventable Diseases Branch, Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA

Correspondence
Qi Jin
zdsys{at}vip.sina.com
Jianguo Xu
Xujg{at}public.bta.net.cn

Received 1 March 2007
Accepted 25 May 2007

An increase in the number of serogroup C meningococcal disease cases occurred in China from September 2003 to January 2006 as a result of several successive outbreaks. In addition, the proportion of serogroup C Neisseria meningitidis isolates from sporadic cases and carriers has also increased. In this study, 113 serogroup C meningococcal isolates were characterized by multilocus sequence typing (MLST) and PorA typing. These isolates comprised those from outbreak cases and their close contacts, the national carriage survey conducted during the same period and some historical isolates from 1966–2002. Twenty MLST sequence types (STs) and 21 PorA variable region (VR) types were identified in the collection. The ST-4821 complex, a newly identified lineage, was the most prevalent lineage (95/113). These data also showed a high level of diversification of serogroup C isolates, as indicated by the number of variants of the ST-4821 clone and the VR types present. There were ten PorA VR types among the ST-4821 isolates, and certain VR types (P1.7-2,14, P1.12-1,16-8) were associated with isolates from outbreak cases. The results of this study allow us to draw a profile of the molecular characteristics of serogroup C strains in China. These data are helpful for monitoring the spread of virulent strains and will provide valuable information for the prevention of bacterial meningitis in China.

Abbreviations: MLST, multilocus sequence typing; ST, sequence type; VR, variable region.

{dagger}These authors contributed equally to this work.






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