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Influence of the K15 capsule on serum resistance of UPEC strain 536 and various capsule-negative derivatives. Bacteria were incubated in 50% serum obtained from a healthy individual. The graph shows means ± standard errors of the means of values originated from three similar assays. The values obtained for the rfaH-negative mutant are significantly different (P < 0.01) between the time points from 1 to 4 h (Student's t test).
