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The live vaccine strain TAD Salmonella vacT (vacT) carrying gyrA mutations W59R, G75A, D87G and A866S shows resistance to nalidixic acid and rifampicin, but increased susceptibility to macrolides, fluoroquinolones and phenylalanyl-arginyl-beta-naphthylamide. This phenotype contrasts with the presence of the gyrA mutation D87G usually associated with reduced susceptibility to fluoroquinolones. Thus, a possible compensatory effect on the suppression of gyrA-mediated resistance by gyrA mutations within the quinolone resistance-determining region alone or in combination (intragenic) or by a mutation affecting AcrAB-TolC (extragenic), the major multidrug resistance efflux pump in Salmonella, was investigated.

the journal of antimicrobial chemotherapy/journal of antimicrobial chemotherapy

The role of intra- and extragenic compensatory mutations in the suppression of fluoroquinolone resistance in a Salmonella Typhimurium gyrA mutant (D87G)