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Subpopulation of cells surviving antibiotics and complement killing. Cells were grown to stationary phase in LB medium and diluted in fresh LB medium or PBS supplemented or not with HIS or serum (final concentration, 50%). Cells were incubated in the presence of ampicillin (A), norfloxacin (B), or amikacin (C). The number of surviving cells (CFU/ml) was determined after 150 min by plating. The averages and standard deviations of at least three independent experiments are presented.
