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Objective To investigate the serotype distribution and antibiotic resistance characteristics of Salmonella isolated from retail poultry and pork meat in Shanghai. Methods The 109 Salmonella strains isolates from retail chicken meat and pork meat in Shanghai in 2021—2022 were collected, and serotyped by serum agglutination method. The antibiotic susceptibility of 7 classes of 14 kinds of antibacterial drugs was determined by microbroth dilution method, and the antibiotic resistance genes were analyzed by whole genome sequencing. Results A total of 22 serotypes were identified in the 109 Salmonella strains, with the Corvallis serotype being the predominant one in retail poultry chicken meat and the London serotype being the predominant one in pork meat. The 96.3% of the isolates strains were resistant to antibiotics, with the highest resistance rates to tetracycline, ampicillin, chloromycetin, and cotrimoxazole. Multi-drug resistant isolates accounted for 61.4% of all isolates, with the highest resistance to 7 classes of 12 antibiotics. All isolates were found to harbor resistance genes, with a total of 68 resistance genes identified. Conclusion The serotype of Salmonella isolated from retail poultry and pork meat in Shanghai in 2021—2022 is complex, with a high overall level of resistance and severe multi-resistance. The isolates carry multiple resistance genes, and the drug resistance is correlated with the resistance genes they carried. Continuous monitoring of foodborne Salmonella and in-depth research on important resistance mechanisms and transmission mechanisms are of great significance for ensuring food safety and guiding clinical drug use in China.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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