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Volume 14, Number 5—May 2008

Dispatch

Spread of Streptococcus suis Sequence Type 7, China

Changyun Ye*†1, Xuemei Bai†1, Ji Zhang†1, Huaiqi Jing†1, Han Zheng*1, Huamao Du†, Zhigang Cui†, Shouying Zhang†, Dong Jin*, Jianguo Xu*†Comments to Author , Yanwen Xiong*, Ailan Zhao*, Xia Luo*, Qiangzheng Sun*, Marcelo Gottschalk‡, and Yanmei Xu*Comments to Author 
Author affiliations: *State Key Laboratory for Infectious Disease Prevention and Control, Beijing, People’s Republic of China; †National Institute for Communicable Disease Control and Prevention, Changping, People’s Republic of China; ‡Université de Montréal, Montréal, Québec, Canada;

Main Article

Figure 2

Horizontal transfer events of virulence genes and conjugative transposon Tn916 with tetM in Streptococcus suis sequence types. The rooted maximum-parsimony tree was based on the concatenated sequences of 7 housekeeping genes used for multilocus sequence typing analysis of S. suis by using S. pneumoniae R6 as the outgroup. Virulence genes acquired by strains of various sequence types were from this study and other published papers. The colored labels indicate positive detection; uncolored labels indicate negative results for the virulence gene; no label indicates that the strain was not available for testing. The scale bar indicates a branch length corresponding to 100 character-state changes.

Figure 2. Horizontal transfer events of virulence genes and conjugative transposon Tn916 with tetM in Streptococcus suis sequence types. The rooted maximum-parsimony tree was based on the concatenated sequences of 7 housekeeping genes used for multilocus sequence typing analysis of S. suis by using S. pneumoniae R6 as the outgroup. Virulence genes acquired by strains of various sequence types were from this study and other published papers. The colored labels indicate positive detection; uncolored labels indicate negative results for the virulence gene; no label indicates that the strain was not available for testing. The scale bar indicates a branch length corresponding to 100 character-state changes.

Main Article

1These authors contributed equally to this article.

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