Epidemic characteristics of animal plague in eastern sector of Altay Mountains of Xinjiang
Objective To analyze the epidemic feature,characteristics and scope of plague focus in the eastern sector of Altay Mountains in Xinjiang,so as to provide reference data for formulating control measures of plague.Methods According to the data of epidemiological investigation on plague from 2015 to 2017,the surveillance data of plague from 2021 to 2023 were analyzed epidemiologically.Software EXCEL 2010 and SPSS 17.0 were employed to process the data and carry out statistical analysis.Results There were rodents and carnivores of 10 species,10 genus and 7 families were captured totally during the period of investigation,including Citellus undulatus,Marmota baibacina,Clethrionomys rufocanus,Microtus gregalis,and Ochotona alpina,migratorius pallas,Mus musculus,Euchoreutesnaso sclater,Sorex araneus and Mustela putorius.Nine hundred and forty-six samples of animal viscera and 1 286 vector parasitic fleas of 53 groups were examined bacteriologically,and 992 samples of animal sera and 77 samples of heart infusion of small rodents and 935 samples of animal organ abrasive fluid,11 samples of bone marrow suspension and 53 samples of vector flea abrasive fluid were tested immuno-serologically.Two methods of IHA and ELISA were carried out to detect for F1 antibody in animal sera and heart infusion of small rodents.There were 6 of shepherd dog,3 of Citellus undulatus and 6 of Mustela putorius with positive F1 antibody to plague.Meanwhile,RIHA and ELISA were conducted to determine F1 antigen to plague in suspension samples of the animal viscera,bone marrow and vector flea.Four samples of Citellus undulatus,2 of Marmota baibacina and 1 of vector flea group(Oropsylls silantiew)were detected with positive F1 antigen to plague.By bacteriological detection,Yersinia pestis was isolated in Huahaizi of Sandaohaizi area of Qinghe County of Altay,Xinjiang,that is,3 strains from Citellus undulatus,1 from Marmota baibacina and 1 from vector flea group(Oropsylls silantiew).Conclusion There is plague natural focus in the Altay Mountains,Xinjiang,that is plague natural focus with double host of Marmota baibacina and Citellus undulatus.Epidemics of plague persist among animals.
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