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Virulence of wild-type and phoP mutant Y. pseudotuberculosis in mice. Wild-type Y. pseudotuberculosis 32777 and the isogenic phoP mutant 32777phoP::kan were used to challenge C57BL/6 mice by the intragastric route. Groups of 10 animals were infected with 109 CFU of a strain, and mortality was monitored for 21 days after challenge.
