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Survival and LD50 analysis in C57BL/6J mice infected with the wild-type and ΔpsaA, Δcaf1, and ΔpsaA Δcaf1 mutant strains of Y. pestis. Groups of 10 mice were infected s.c. in the neck with serial 10-fold dilutions of the wild-type (A) or ΔpsaA (B), Δcaf1 (C), or ΔpsaA Δcaf1 (D) mutant strain. Shown is a representative experiment of two independent experiments.
