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Synergy between the phage and ampicillin in the endpoint microdilution assay. The percentage of the growth of Escherichia coli O157 in the presence of ampicillin at concentrations of 1.562, 3.125, 6.25, 12.5, 25 µg/ml and by the same concentrations mixed with the phage at MOI 10; the incubation time was 6 hours at 37 °C
