Investigation and epidemic risk analysis of new plague foci and vicinal regions in Jinghong,Yunnan Province,China
Objective To investigate host animals in new plague foci with a new outbreak in 2016 and vicinal regions in the plague foci of Rattus tanezumi in Jinghong,Yunnan Province,China,and to determine the epidemic situation and risk of plague among animals,so as to provide a basis for plague monitoring,prevention,and control in this area.Methods An investigation was carried out on host animals and vectors in the plague foci in Puwen Town and Dadugang Township,Jinghong City in September 2022.Bacteriological,serological,and molecular biological laboratory tests were conducted on the visceral organs,serums,and parasitic fleas of small mammals captured and collected.Results A total of 61 small mammals were obtained,which belonged to 7 species from 4 genera,3 families,and 2 orders.R.tanezumi accounted for 79.66％ and was the dominant species.A total of 35 parasitic fleas were collected on the body surface of small mammals,all of which were Xenopsylla cheopis.The flea index ranged from 1.00 to 2.00 in the residential area and from 0.00 to 0.38 in the wild area.Of 119 samples (induding 2 samples for reverse indirect hemagglutination assay) for testing serologically,61 small mammal samples and 35 flea samples for testing bacteriologically,and 4 DNA samples from small mammals detected by quantitative real-time polymerase chain reaction,two F1 antibody-positive serum samples of R.tanezumi were detected.No Yersinia pestis was isolated and no specific gene fragment of Y.pestis was detected.Conclusions Main host animals and vector fleas of plague are widely distributed in Puwen Town and vicinal regions in Jinghong,and the capture rate of host animals and their flea index are relatively high in some areas,indicating an epidemic risk of plague.It is suggested that preventive rodent and flea control should be carried out in time in areas with high capture rate of host animals and flea index,and continuous plague monitoring should be strengthened to prevent the occurrence of human plague.
Rattus tanezumiPlague natural focusEpidemicJinghong City
万方数据
维普
