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Effect of the Y. pestis ymt gene on the ability of serotype O3 Y. pseudotuberculosis strains to persist in the flea digestive tract. Percentages of fleas that remained infected during a 4-week period following a single infectious blood meal containing the YPIII (□), K171 (▵), YPIII(pCH16) (▪), or K171(pCH16) (▴) strain of serotype O3. The average and standard deviation of the results of three independent infection experiments for each strain are shown.
