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Frequency of mutants of K2534 (a and c) and K3325 (b and d) resistant to the lytic phage vB_KpnM-VAC13 or the tested drugs (mitomycin C [MitC] and imipenem [IMP]), alone or in combination with the phage over 24 h. *, P < 0.05; **, P < 0.01. Absence of asterisk indicates the result was not statistically significant.
