Mechanisms of resistance to quinolones in Salmonella Typhimurium from patients with infectious diarrhea

This study investigated the mechanisms of resistance of 36 quinolone‐resistant Salmonella Typhimurium strains isolated from outpatients with infectious diarrhea in Beijing Tian Tan Hospital between 2013 and 2015. The resistance spectrum of the 36 strains was measured using a broth dilution method. Class 1 integrons harboring the β‐lactamase gene and mutations in quinolone resistance determining regions were also investigated. All 36 quinolone‐resistant Salmonella Typhimurium strains were found to be multidrug‐resistant and the majority of these strains harbored Class 1 integrons. These findings study suggests that strategies for determining resistance spectrums should be implemented with greater urgency.