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Following incubation with (A) E. coli or (B) S. aureus for 2, 4 or 7 days, the apparent bacterial colonies on blank membranes, CPFX membranes and streptomycin membranes were quantified and displayed in logarithmic form. ***P<0.001. CPFX, ciprofloxacin; Strep, streptomycin.
