ObjectiveTo analyze the epidemiological characteristics of Salmonella Enteritidis and Salmonella Typhimurium isolated from diarrhea patients in Shunyi district of Beijing during 2013–2018, and provide evidence for the effective prevention and control of diarrhea.
MethodsIsolated Salmonella strains were from stool samples of diarrhea patients in surveillance project in Shunyi from 2013–2018. Serotyping and pulsed-field gel electrophoresis (PFGE) were conducted for the isolated strains of S. Enteritidis and S. Typhimurium, and χ2 test was conducted for the analyses on the population distribution and clinical symptoms of S. Enteritidis and S. Typhimurium infections.
ResultsThe overall isolation rate of Salmonella was 5.63% (109/1 936), and the constituent ratios of S. Enteritidis and S. Typhimurium were 32.73% (36/110) and 28.18% (31/110). The isolation rates of S. Enteritidis and S. Typhimurium were 1.85% and 1.60% respectively, the latter's fluctuation range was significantly larger than the former, and the isolation rates of the two pathogens showed an annual one fall but another one rise trend. Two detection peaks were found for S. Enteritidis, i.e. during April - May and during September - October, and three detection peaks of S. Typhimurium were in April, July and September. The isolation rate of S. Typhimurium was higher in the western part of Shunyi (2.49%) than in other parts of Shunyi. PFGE pattern of S. Enteritidis showed two banding clusters in a short time, and PFGE pattern of S. Typhimurium showed six banding clusters in a short time.
ConclusionS. Enteritidis and S. Typhimurium spread had certain epidemiological characteristics in diarrhea cases in Shunyi, the serotype level analysis is more conducive to discover potential outbreaks, and the epidemiological investigation of " sporadic outbreaks” should be carried out to provide evidence for the effective prevention and control of Salmonella infection.
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