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Polymerase chain reaction products of the main putative virulence markers. Lane 1: DNA ladder mix; Lane 2: vacAs1m1 genotype; Lane 3: vacAs1m2 genotype; Lane 4: vacAs2m2 genotype; Lane 5: iceA1+iceA2 genotype; Lane 6: babA genotype; Lane 7: cagA genotype
