Emerging Infectious Disease ISSN: 1080-6059

Lineage and Virulence of Streptococcus suis Serotype 2 Isolates from North America

Nahuel Fittipaldi, Jiangu Xu, Sonia Lacouture, Prasit Tharavichitkul, Makoto Osaki, Tsutomu Sekizaki, Daisuke Takamatsu, and Marcelo Gottschalk

Author affiliations: Université de Montréal, St-Hyacinthe, Quebec, Canada (N. Fittipaldi, S. Lacouture, M. Gottschalk); National Institute for Communicable Disease Control and Prevention, Beijing, People’s Republic of China (J. Xu); Chiang Mai University, Chiang Mai, Thailand (P. Tharavichitkul); Agriculture, Forestry and Fisheries Research Council, Tokyo, Japan (M. Osaki); The University of Tokyo, Tokyo (T. Sekizaki); National Institute of Animal Health, Tsukuba, Japan (D. Takamatsu)

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Figure 2

Survival of CD1 mice inoculated with the different Streptococcus suis sequence type 28 strains from North America. In this experiment, the infectious dose was 1 × 108 CFU/animal, 10-fold higher than in the previous experimental inoculation. Doses were intraperitoneally injected into the animals. No significant differences were found between groups.

Figure 2. Survival of CD1 mice inoculated with the different Streptococcus suis sequence type 28 strains from North America. In this experiment, the infectious dose was 1 × 10⁸ CFU/animal, 10-fold higher than in the previous experimental inoculation. Doses were intraperitoneally injected into the animals. No significant differences were found between groups.

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