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The 600 Da BPEI and oxacillin comprise a bactericidal combination in MRSA 700787. Cells treated individually with BPEI or oxacillin were still able to grow, but growth was inhibited when both BPEI and oxacillin were used (A). A time–kill curve shows that the combination has a bactericidal mechanism of action as seen with the drop in viable cell counts after 4 h (B). Error bars denote standard deviation (n = 3).
