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Virulence of fliC mutants in a neonatal BALBc/ByJ mice. The percentage of mice inoculated which developed pneumonia (recovery of >103 CFU/lung), bacteremia, or mortality is indicated. Numbers of mice inoculated with the various strains: PAK, 30; PAK/NP, 29; PAK/fliC, 28; and PAK/NP/fliC, 25.
