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Accumulation of ciprofloxacin by the two ciprofloxacin-resistant isolates of genosubtype Ia of Salmonella enterica serotype Typhimurium and genosubtype B1 of S. enterica serotype Choleraesuis and one clinical isolate of S. enterica serotype Typhimurium (ciprofloxacin MIC = 0.06 μg/mL). Carbonyl cyanide m-chlorophenylhydrazone (CCCP) (100 μM) was added at the time indicated by the arrow.
