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Ciprofloxacin minimum bactericidal concentrations (MBCs) in relation to the MICs among 89 ciprofloxacin-resistant Escherichia coli isolates. H30 subclone members and non-H30 isolates are shown separately. Isolates containing aac(6′)-Ib-cr (aac) and/or nonsynonymous mutations at parE458 were excluded.
