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Mutational loss of the Y. pestis acyltransferases MsbB and LpxP does not affect flea infection. The percentage of fleas infected (A), average Y. pestis CFU per infected flea (B), and percentage of fleas that developed proventricular blockage (C) were equivalent after infection with either Y. pestis KIM6+ (•) or Y. pestis ΔmsbB ΔlpxP (○). The mean and standard deviation of two independent experiments are indicated.
