Fig. 2

Effects of sub-MIC levels of β-lactam antibiotics on the conjugation frequency of IncI2 plasmid. Fold change of IncI2 plasmid transfer for (A) intra-species and (B) inter-species mating. C Fold change of conjugation frequency of IncI2 plasmid between wild type E. coli SMS27 and E. coli C600. (ns P > 0.05; * P < 0.05; ** P < 0.01)