51. Distribution and dissemination of antimicrobial-resistant Salmonella in broiler farms with or without enrofloxacin use
- Author
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Ke Shang, Bai Wei, and Min Kang
- Subjects
Salmonella ,Antimicrobial resistance ,Circulating contamination ,Enrofloxacin ,Broiler farm ,Litter ,Veterinary medicine ,SF600-1100 - Abstract
Abstract Background Salmonella is a major zoonotic food-borne pathogen that persists on poultry farms, and animals undergo reinfection with endemic strains. The present study aimed to investigate the characteristics and dissemination of antimicrobial-resistant Salmonella within and between broiler farms that used enrofloxacin and those that did not. Results Cloacal and environmental (litter, feed, and water) samples from two selected flocks in each of 12 farms owned by the same company were collected three times over a 30-day period of two production cycles during 2015–2016. The rate of Salmonella isolation was 7.8% (123/1584). Nine Salmonella serotypes (116 isolates) and seven untypable isolates were identified, and Salmonella Montevideo was the most prevalent serotype. Azithromycin-resistant (17.9%) and colistin-resistant (3.3%) isolates were detected, and multidrug-resistant isolates (43.1%) were also observed. No isolate was resistant to enrofloxacin or ciprofloxacin; however, intermediate resistance to enrofloxacin was significantly higher (P
- Published
- 2018
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