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Outline
To analyze of the contamination status of pathogenic bacteria in ready-to-eat fruit and vegetable products in Gansu Province in 2024.
According to the principle of random sampling, a total of 241 ready-to-eat fruit and vegetable products were collected from the catering and distribution sectors across the province. According to the series of methods in the GB 4789—2016 National food safety standards-Food microbiological examination, tests were conducted on diarrheagenic Escherichia coli, Listeria monocytogenes, Salmonella and Staphylococcus aureus. The whole genome sequencing was performed on the detected Listeria monocytogenes and Staphylococcus aureus to obtain the multilocus sequence typing results. Drug sensitivity tests were conducted on the diarrheagenic Escherichia coli, Listeria monocytogenes and Salmonella species.
The overall detection rate of pathogenic bacteria in 241 ready-to-eat fruit and vegetable products was 5.81%. Among them: Listeria monocytogenes had the highest detection rate, at 3.73% (9/241); followed by diarrheagenic Escherichia coli and Staphylococcus aureus, with a detection rate of 0.83% (2/241); the detection rate of Salmonella was 0.41% (1/241). The 9 strains of Listeria monocytogenes belonged to 4 different sequence type (ST) types. Among them, 4 strains were ST87,2 strains were ST121, 2 strains were ST288 and 1 strain was ST378. The 2 Staphylococcus aureus strains belong to 2 ST types, one of which was ST1 and the other was ST59. One strain of diarrheagenic Escherichia coli was drug-resistant, and the drug resistance spectrum was ampicillin-amoxicillin/clavulanate-cefazolin-cefotiofur-streptomycin-florfenicol.The 4 strains of Listeria monocytogenes were resistant, with the resistance spectrum being tetracycline-erythromycin.One strain of Salmonella was resistant, and the resistance spectrum was ertapenem-meropenem-streptomycin.
In 2024, the contamination of pathogenic bacteria in ready-to-eat fruit and vegetable products in Gansu Province mainly original from cold dishes. The detection rate of Listeria monocytogenes is relatively high compared to the other 3 kinds of bacteria, which requires close attention.
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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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