Fig. 1From: Comparison of the virulence of Streptococcus pneumoniae in ICR mouse stocks of three different originsSurvival rates (%) of Korl:ICR, A:ICR, and B:ICR stocks infected with S. pneumoniae D39 serotype 2 with CFU of 2 × 106 (a), 2 × 107 (b) and 2 × 108 (c). Significant death rate of mice in B:ICR than in Korl:ICR and A:ICR was observed only at 2 × 108 CFU (P < 0.01). P values were calculated by the log-rank testBack to article page