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Virulence of wild-type and superantigen-deficient Y. pseudotuberculosis in mice. Wild-type Y. pseudotuberculosis (●) and its ypmA isogenic mutant H194 (○) were injected i.v. into OF1 mice. Groups of seven animals were challenged with 106.3 (A), 105.3 (B), 104.3 (C), or 103.3 (D) bacteria, and mortality was monitored over a 3-week period.
