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| Characteristics of Salmonella infection among foodborne disease cases in Jinhua City |
| LÜ Gongjin1, YANG Chen1, YANG Yang2, SHENTU Pingping1
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1. Jinhua Center for Disease Control and Prevention, Jinhua, Zhejiang 321002, China;
2. Jinhua Center Hospital, Jinhua, Zhejiang 321013, China |
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Abstract Objective To analyze the epidemiological characteristics of Salmonella infection among foodborne disease cases in Jinhua City, Zhejiang Province from 2019 to 2024, so as to provide the evidence for strengthening the prevention and control of foodborne diseases. Methods Data on foodborne disease cases in Jinhua City from 2019 to 2024 were collected via the Zhejiang Provincial Foodborne Disease Surveillance and Reporting System. Stool or anal swab specimens were collected for Salmonella detection and serotype identification. Descriptive statistical analysis was performed to analyze the population, temporal and regional distribution, clinical manifestations and suspected food exposure of Salmonella infected cases. The concentration ratio method was used to explore the monthly distribution characteristics and concentration degree of Salmonella infection, and the circular distribution method was adopted to estimate the peak date and epidemic period of Salmonella infection. Results A total of 24 044 foodborne disease cases were reported in Jinhua City from 2019 to 2024, among which 1 376 Salmonella strains were isolated with a positive detection rate of 5.72%. A total of 96 Salmonella serotypes were identified, dominated by Salmonella Typhimurium (573 strains, accounting for 41.64%). The detection rates were relatively higher in children aged 0-<6 years and scattered children, reaching 16.56% and 17.48%, respectively. The high incidence period was from May to October with detection rates ranging from 5.55% to 8.75%. The concentration ratio M was 0.48, indicating obvious seasonal distribution of Salmonella infection. The peak date of infection was July 24th, and the peak period of infection was from May 15th to October 2nd. Yongkang City and Dongyang City had higher positive rates of 11.41% and 10.87% separately. Among cases infected with Salmonella, the main clinical symptoms were diarrhea and abdominal pain, involving 1 369 cases (99.49%) and 785 cases (57.05%). Infant food, store-sold food and bulk food had higher Salmonella positive rates at 15.38%, 8.14% and 6.35% respectively. Conclusions Salmonella Typhimurium was the predominant serotype of Salmonella infection among foodborne disease cases in Jinhua City from 2019 to 2024. The infection peaks in summer and autumn. Children were the key population for prevention and control, and Yongkang City and Dongyang City were key priority areas. Priority supervision should be strengthened on infant food, store-sold food and bulk food.
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Received: 18 December 2025
Revised: 26 March 2026
Published: 27 May 2026
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