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Outline
To study the spatiotemporal distribution and drug resistance of foodborne Salmonella in Zhenjiang Region.
From 2021 to 2024, according to the Jiangsu Province foodborne disease surveillance work manual, stool samples from foodborne diarrhea cases were collected from sentinel hospitals in 4 urban districts of Zhenjiang City. Salmonella isolation and cultivation, serotyping and drug sensitivity tests (using the broth microdilution method) were performed.
Out of 2547 samples of foodborne diarrhea, 117 strains of Salmonella were detected, with a detection rate of 4.59%. Among them, the sample size was larger in summer and autumn, with higher positive detection rates (5.31% and 4.75%). There was a statistically significant difference in the detection rate of Salmonella in different seasons (χ2=6.61, P<0.05). The detection rates of Salmonella in Runzhou District and Danyang City (8.23%, 7.77%) were significantly higher than those in other areas (χ2=66.622, P<0.05). The predominant serotypes in Zhenjiang Area were Salmonella typhimurium (45.30%). The drug resistance rate of Salmonella in this area was high (82.05%). The highest resistance was to ampicillin (82.05%), followed by tetracycline(70.09%) and ampicillin/sulbactam (64.10%), chloramphenicol (52.14%) and so on, and the situation of multidrug resistance was 75.21%, with a multidrug resistance spectrum of 52, mainly ampicillin-ampicillin/sulbactam-tetracycline-chloramphenicol-sulfamethoxazole-trimethoprim (12.50%) and ampicillin-ampicillin/sulbactam-nalidixic acid-polymyxin E (7.95%).
Foodborne Salmonella in Zhenjiang region has a high incidence in summer and autumn, with relatively high detection rates in Runzhou District and Danyang City. The serotypes are diverse, and the strains exhibit high antibiotic resistance rates and complex multidrug resistance spectrum. These results provide a key scientific basis for precise early warning of local foodborne diseases, guidance for empirical clinical medication, and the formulation of antibiotic resistance monitoring policies.
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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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