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(a) Mutation rate in Escherichia coli MG1655 (EcWT); (b) mutation rate in Salmonella enterica subsp. enterica serovar Typhimurium LT2 (SeWT) grown in MHB without (■) and with subinhibitory doses (0.5 × MIC) of AEN (■), COLIFIT (■), amoxicillin (■), and colistin (■). Mutagenesis frequency was expressed as the number of rifampicin-resistant cells in the total microbial population. Different letters represent statistically different values (p ≤ 0.05).
