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Outline
To investigate the contamination status, serotype distribution and antimicrobial resistance characteristics of Salmonella in retail raw chicken in Guangzhou.
From 2023 to 2024, raw chicken samples were collected from retail markets in Guangzhou for Salmonella isolation and identification. Serotyping and antimicrobial susceptibility testing against 21 agents from 9 classes were performed.
Among 280 raw chicken samples, the overall detection rate of Salmonella was 29.29% (82/280) and 85 strains of Salmonella were isolated.Storage temperature and sampling site significantly affected the detection rate. The rate was highest in ambient fresh chicken (34.56%, 47/136), followed by chilled chicken (29.47%, 28/95), and lowest in frozen chicken (14.29%, 7/49)(χ2=7.151, P=0.028). Among sampling sites, the detection rate was highest in wet markets (38.39%, 43/112), compared to supermarkets and online stores (both 23.21%: 26/112 and 13/56, respectively) (χ2=7.476, P=0.024). The predominant serotypes were Salmonella agona, Salmonella corvallis and Salmonella indiana. The detection rate of drug-resistant strains was 92.94% (79/85), with highest resistance to tetracycline (78.82%), followed by ampicillin (67.06%), and chloramphenicol and florfenicol (both 64.71%). All isolates remained susceptible to ceftazidime/avibactam. Multidrug-resistant strains accounted for 70.59%, with some resistant to up to 8 antimicrobial classes.
Salmonella is detected at a relatively high rate in raw chicken in Guangzhou, exhibiting diverse serotypes and severe antimicrobial resistance, underscoring the need for enhanced meat safety surveillance and antimicrobial stewardship.
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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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