Objective To understand the carriage, bacterial type distribution, and drug resistance of Salmonella in employees in the food and public place services in Yulin, Guangxi Zhuang Autonomous Region, and provide evidence for the development of local prevention and control plan for intestinal infectious diseases.
Methods Salmonella isolation and serotyping were performed by using anal swabs collected from the employees; Drug susceptibility of the Salmonella strains to 28 antibiotics were tested by using micro broth dilution method.
Results A total of 54588 samples were tested, and the detection rate of Salmonella was 1.85% (1012/54588). The detection rate was higher in summer and autumn than winter and spring. Two drug sensitive plates were randomly used for 1012 Salmonella strains (NMIC-413 drug sensitive plate for 905 Salmonella strains, and RUONMIC-801 drug sensitive plate for 107 Salmonella strains). Due to the difference of antibiotic types, statistical analysis could not be carried out, only analyze the results of 905 strains of NMIC-413 drug sensitive plates. The 1012 strains of Salmonella were divided into 56 serotypes. The first three serotypes were S. typhimurium (22.83%), S. lissenii (11.07%) and S. argonne (6.03%). The drug susceptibility test results of 905 strains showed that the drug resistance rate was 68.84%, and the resistance rate of strains to tetracycline was highest (59.34%), followed by that to chloramphenicol (49.28%) and trimethoprim/sulfamethoxazole (37.13%). The multidrug resistance rate was 40.55%.
Conclusion The Salmonella carrying rate was high in the employees engaged in food and public place services in Yulin, and the serotypes of the Salmonella detected were complex. The detection rate of Salmonella varied with season, and the drug resistance level of the strains was high and multiple drug resistance was serious. It is necessary to strengthen the health surveillance for the early detection of Salmonella carriers and standardized medication.
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