Carrying rate of leptospira on rodents from 2021 to 2022 in Sichuan Province
Objective To understand the population composition and carrier status of Leptospira rodentium in Sichuan Province,and to provide a scientific basis for further surveillance and prevention of Leptospira spp.Methods From 2021 to 2022,six monitoring sites in Sichuan Province were selected to detect the carrier rate of Leptospira murine host animals by fluorescence quantitative PCR.SPSS 25.0 statistical software was used to calculate carrier rate,with a significance level of P＜0.05.Results Totally,885 rodents were captured.Anourosorex squamipes Milne-Edwards accounted for 35.82％,Apodemus agrarius accounted of 23.84％,and the Rattus norvegicus accounted for 20.56％,Apodemus chevrieri accounted for 12.77％,and the rest rats accounted for 5.99％.129 positive samples were detected by fluorescence quantitative PCR,with a carrier rate of 14.58％.Apodemus chevrieri has the highest rate of 35.40％,followed by Apodemus agrarius(21.33％),Anourosorex squamipes Milne-Edwards(10.09％),Apodemus sylvaticus Linnaeus(8.33％),Mus musculus(6.45％),and Rattus flavipectus has the lowest rate of 4.95％.Significant differences in carrier rates were found among different regions and rodent species.The carrier rate of 2022 is significantly higher than that in 2021(x2=5.547,P＜0.001),and the carrier rate in autumn is significantly higher than that in summer(x2=44.665,P＜0.001).Conclusions There is an epidemic of leptospirosis among rodents at monitoring points,and the risk of carrying in autumn is higher than summer in 2021-2022.Apodemus chevrieri and Apodemus agrarius have higher carrying rates.The risk of leptospirosis infection in Qianwei and Liangshan Prefecture is higher.Thus,target monitoring and control should be strengthened in the second half of the year.
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