Surveillance of Hemorrhagic Fever With Renal Syndrome in Sichuan Province,2007-2009

Objective To understand the current status of hemorrhagic fever with renal syndrome(HFRS)epidemic and the host animals in Sichuan province,provide scientific evidence for the prevention and control of HFRS.Methods The data of HFRS epidemic in Sichuan were collected,the night-trapping was conducted to monitor rodents' density and the immunofluorescence technique was used to detect the virus antigen.Results A total of 284 HFRS cases,including 2 deaths,were reported in Sichuan from 2007 to 2009.The main epidemic areas were in Liangshan,Nanchong,Guang'an and Dazhou.A total of 2046 rodents of 10 species were captured in the surveillance sites in Yanyuan of Liangshan,in Kaijiang of Dazhou and in Nanchong,the rodents density was 10.29%.Rattus norvegicus and Mus musculus were the predominant rodents in residential areas,Anourosorex squamipes and Apodemus chevieri were the predominant rodents in the open field.The Hantavirus-carrying rate was 2.22% in rodents.Hantavirus was detected from Rattus norvegicus,Apodemus agrarius,Mus musculus,Rattus flavipectus.Conclusion Rattus norvegicus,Apodemus agrarius were still the main host animals of Hantavirus in Sichuan province.Yanyuan county is the Rattus type epidemic area of HFRS,the other HFRS epidemic areas belong to mixed type with Apodemus to be predominant.The surveillance showed that the incidence of HFRS would remain at a low level in 2 or 3 years in Sichuan,it is necessary to strengthen the surveillance of HFRS.