Investigation on the infection status of schistosomiasis in wild mice in hilly schistosomiasis endemic regions of Anhui Province
Objective To understand the status of schistosomiasis infection in wild mice in two hilly schistosomiasis endemic regions of Anhui Province,and to provide a basis for the formulation of strategies for schistosomiasis prevention and control.Methods Two hilly schistosomiasis endemic regions(Guichi District and Shitai County)in Chizhou City of Anhui Province were selected.In each county(district),one village with the distribution of infected snails was selected as the observation village,and one village without infected snail as the control village.The wild mice were captured using the night trapping method and the densities of mice were calculated.Liver tissues slide microscopy,mesenteric tissue microscopy and Kato-katz method were used to detect Schistosoma infections in wild mice.The differences in infection rates of Schistosoma japonicum among different mouse species were compared using the Chi-square test.Results Five species of wild mice were captured in the observation village of Guichi District(Likang Village),namely,Apodemus agrarius,Rattus losea,Rattus flavipectus,Rattus norvegicus,and Niviventer confucianus.The density of mice was 4.44％.The infection rate of Schistosoma japonicum was 39.56％.There was a statistically significant difference(x2=7.584,P=0.023)in the infection rate of Schistosoma japonicum among different species of wild mice.In the control village(Longchi Village),the density of mice was 2.24％,and no wild mice were found to be infected with Schistosoma japonicum.In the observation village(Dongzhuang Village)of Shitai County,four species of wild mice(Apodemus agrarius,Rattus losea,Rattus norvegicus,and Niviventer confucianus)were captured.The density of mice was 11.73％and the infection rate of Schistosoma japonicum was 46.90％.There was a statistically significant difference(x2=10.637,P=0.014)in the infection rate of Schistosoma japonicum among different species of wild mice.In the control village(Qidu Village),the density of mice was 8.78％,and no wild mice were found to infected with Schistosoma japonicum.Conclusion In some hilly areas of Anhui Province,there are many species of wild mice with high densities and high infection rate of Schistosoma.Wild mice may be a potential infection source of transmission of schistosomiasis.Surveillance should be strengthened.
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