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Volume 12, Number 8—August 2006
Research

Streptococcus suis Sequence Type 7 Outbreak, Sichuan, China

Changyun Ye*†1, Xiaoping Zhu‡, Huaiqi Jing*1, Huamao Du*1, Mariela Segura§1, Han Zheng*1, Biao Kan*, Lili Wang*, Xuemei Bai*, Yongyun Zhou*, Zhigang Cui*, Shouying Zhang*, Dong Jin*, Na Sun*, Xia Luo*, Ji Zhang*, Zhaolong Gong*, Xin Wang*, Lei Wang*, Hui Sun*, Zhenjun Li*, Qiangzheng Sun*, Honglu Liu¶, Boqing Dong#, Changwen Ke#, Hui Yuan**, Hua Wang††, Kecheng Tian‡‡, Yu Wang†, Marcelo Gottschalk§, and Jianguo Xu*†Comments to Author 
Author affiliations: *National Institute for Communicable Disease Control and Prevention, Beijing, People's Republic of China; †State Key Laboratory of Infectious Diseases Prevention and Control, Beijing, People's Republic of China; ‡Sichuan Provincial Center for Disease Control and Prevention, Chengdu, People's Republic of China; §Université de Montréal, Montreal, Quebec, Canada; ¶Guangxi Provincial Center for Disease Control and Prevention, Nanning, People's Republic of China; #Guangdong Provincial Center for Disease Control and Prevention, Guangzhou, People's Republic of China; **Jiangxi Provincial Center for Disease Control and Prevention, Nanchang, People's Republic of China; ††Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, People's Republic of China; ‡‡Guizhou Provincial Center for Disease Control and Prevention, Guiyang, People's Republic of China

Main Article

Figure 4

Figure 4. Unrooted Bayesian tree of the concatenated sequence of the 92 sequence types (STs) of Streptococcus suis. The tree was constructed by using MrBayes (version 3.1.1) according to the HKY85 model of DNA substitution with no rate variation across sites. Four Markov chains were run for a million generations, and the Markov chain is sampled every 100 generations (18). The sampled parameter values were summarized by discarding the first 2,000 samples as burn-in. On the basis of the last 9,000 samples taken from the posterior probability distribution, a 50% majority rule consensus tree was computed. The posterior probability given on each branch is a percentage of these trees supporting each node. The 6 lineages defined in this study are shadowed in light gray. The 6 major clonal complexes identified previously by King et al. (8) as well as in this study are shadowed in dark gray. The five STs containing isolates from human invasive disease are shown as red dots.

Main Article

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1These authors contributed equally to this study.

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