Prevalence of hemorrhagic fever with renal syndrome in Liaoning province, 2007-2011

ObjectiveTo analyze the surveillance data on hemorrhagic fever with renal syndrome(HFRS)in Liaoning province from 2007 to 2011 and to assess the trend of HFRS epidemic.MethodsDescriptive epidemiology methods were used to analyze the surveillance data of HFRS from 2007 to 2011.ResultsTotally 4 177 cases and 33 death cases were reported with a case fatality of 1.23% .The morbidity showed an increase tendency but the death rate and case fatality decreased year by year.More HFRS cases were observed in the east and west mountain area and central region of the province and 74.48% of the HFRS cases were reported in the cities of Fushun,Shenyang,Huludao,Jinzhou,Tieling,and Dandong during the five year period.More cases were reported in spring and autumn-winter season,with a epidemic peak in November.The number of the cases reported in males were 2.9 times higher than that of the females and more cases occured in young adults and farmers.Apodemus agrarius and Rattus norvegicus were still the most common and predominant anmimal hosts.ConclusionThe HFRS epidemic presents an increase trend and the density and the virus-positive rate of the animal hosts remains high in some areas of Liaoning province.