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This study aimed to investigate the prevalence, serotype distribution, and antibiotic resistance, and to characterize the extended spectrum β-lactamases (ESBLs) producing  Salmonella  isolates from chicken and pork meats from retail markets in Guangdong province, China. A total of 903 retail meat samples (475 chicken and 428 pork meats) were obtained from six cities (Guangzhou, Shenzhen, Heyuan, Shaoguan, Foshan, and Yunfu) of Guangdong province between May 2016 and April 2017. High levels of  Salmonella  contamination were detected in chicken (302/475, 63.6%) and pork (313/428, 73.1%). Thirty-eight serotypes were identified in 615 detected  Salmonella , and the serotypes varied greatly between chicken and pork samples. Agona (55/302, 18.2%), Corvallis (45/302, 14.9%), Kentucky (38/302, 12.6%), Mbandaka (32/302, 10.6%) was the dominant serotypes in chicken samples. However, Typhimurium (78/313, 24.9%), Rissen (67/313, 24.1%), Derby (66/313, 21.1%), and London (48, 15.3%) were the most common in pork samples. High rates of antibiotic resistance were found to sulfisoxazole (468/615, 76.1%), tetracycline (463/615, 75.3%), ampicillin (295/615, 48.0%), and ofloxacin (275/615, 44.7%). Notably, antimicrobial susceptibility tests identified resistance to polymyxin B (12/615, 2.0%) and imipenem (3/615, 0.5%). Multidrug-resistance (MDR) was detected in  Salmonella  isolated from chicken (245/302, 81.1%) and pork (229/313, 73.2%). The resistance rate of different  Salmonella  serotypes varied widely. Especially, isolates such as Typhimurium, Agona,  C orvallis and Kentucky exhibited highly resistance to antibiotics. The MDR rate of  Salmonella  isolates from chicken was significantly higher than that from pork isolates ( P  < 0.05). Twenty-one  Salmonella  isolates were identified as ESBLs-producing, covering six  Salmonella  serotypes and displaying different pulse field gel electrophoresis (PFGE) genotypes.  Bla OXA- 1    was the dominant ESBLs gene (9/21, 42.9%), followed by  bla CTX-M- 55    (5/21, 23.8%). This study indicated that  Salmonella  was widespread in chicken and pork from retail markets in Guangdong province and the isolates showed high multidrug-resistance, especially the known multidrug-resistant  Salmonella  serotypes. Therefore, it is important to focus on  Salmonella  serotypes and strengthen the long-term monitoring of MDR  Salmonella  serotypes in animal-derived foods.

Highly Prevalent Multidrug-Resistant Salmonella From Chicken and Pork Meat at Retail Markets in Guangdong, China