Figure 2. Virulence of nonencapsulated Streptococcus suis strain NL119 and capsule-recovered NL119 P4 in mice. A) Survival of C57BL/6 mice (n = 10 mice per strain; until 14 days after infection) inoculated intraperitoneally with 5 × 107 CFU of either NL119 or NL119 P4. B) Blood bacterial burden at 24 h after infection. Data of individual mice are presented as log10 CFU/mL with the geometric mean. Asterisks indicate a significant difference between NL119 and NL119 P4 (p<0.05).