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Resistance to complement and to whole-blood killing of K. pneumoniae strains. Bars indicate percentages of viable bacteria after incubation for 3 h in NHS or in fresh human blood. The results represent the means ± standard errors of three independent experiments for wild-type strain USA0352/78 (open bars) and htrA mutant strain USA0352-htrA− (solid bars). A comparison of the htrA mutant and wild-type strains by a two-tailed t test yielded P values <0.01.
