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Microbiological response of ECL15118 (a), ECL9800 (b), ECL6217 (c), and ECL2197 (d) over 24 h when exposed to polymyxin B-containing combinations in TKS. Polymyxin B in combination with tigecycline (filled circle) was the only combination that was consistently bactericidal against all four E. cloacae isolates at 24 h.
