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Susceptibilities of planktonic cultures and biofilms to antibiotics as the observed log reduction in the number of CFU after exposure to 5,000 μg of ampicillin per ml (a and b) or 1.8 μg of ciprofloxacin per ml (c). (a and c) Susceptibility of Kp1 to ampicillin and ciprofloxacin, respectively. (b) Ampicillin treatment of Kp102M. █, untreated controls; , antibiotic-challenged cultures. Error bars reflect ±1 standard error of the mean.
