title: Identification of a Plasmid-Mediated Quinolone Resistance Gene in Salmonella Isolates from Texas Dairy Farm Environmental Samples.
abstract: A recent increase in plasmid-mediated quinolone resistance (PMQR) has been detected among Salmonella isolated from humans in the United States, and it is necessary to determine the sources of human infection. We had previously isolated Salmonella from dairy farm environmental samples collected in Texas, and isolates were tested for anti-microbial susceptibility. Two isolates, serotyped as Salmonella Muenster, showed the discordant pattern of nalidixic acid susceptibility and intermediate susceptibility to ciprofloxacin. For this project, whole-genome sequencing of both isolates was performed to detect genes associated with quinolone resistance. The plasmid-mediated qnrB19 gene and IncR plasmid type were identified in both isolates. To our knowledge, this is the first report of PMQR in Salmonella isolated from food animals or agricultural environments in the United States.
authors: Texas A&M University, College Station, TX, USA.
authors: K J
authors: KJ
authors: Cummings
authors: Texas A&M University, College Station, TX, USA.
authors: L D
authors: LD
authors: Rodriguez-Rivera
authors: Texas A&M University, College Station, TX, USA.
authors: K N
authors: KN
authors: Norman
authors: Texas A&M University, College Station, TX, USA.
authors: N
authors: N
authors: Ohta
authors: Texas A&M University, College Station, TX, USA.
authors: H M
authors: HM
authors: Scott
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology / Q000382:microbiology*; D003612:Dairying; D024881:Drug Resistance, Bacterial / Q000235:genetics; D004783:Environmental Microbiology; D000072480:Farms; D006801:Humans; D015363:Quinolones / Q000494:pharmacology*; D011815:R Factors; D012475:Salmonella / Q000187:drug effects* / Q000235:genetics / Q000302:isolation & purification; D012481:Salmonella Infections, Animal / Q000453:epidemiology / Q000382:microbiology*; D013781:Texas / Q000453:epidemiology; D015047:Zoonoses
chemical_list: D015363:Quinolones
keywords: Antimicrobial resistance; Salmonella spp; dairy cattle; foodborne disease; public health