Epidemiological analysis on the hemorrhagic fever with renal synadrome in Taian city,1984-2001

Objective Epidemiological changes of hemorrhagic fever with renal syndrome(HFRS)in Taian city were to find out. Methods Morbidity rate of HFRS among different seasons, age groups,sex,occupations from 1984 to 2001 were compared respectively. The condition of the host animal carring HFRS virus, the general population's inapparent infection and the type of HFRS epidemic foci were investigated simultaneously.Results There exited period prevalent of HFRS in Taian,and the peak morbidity rate came out per 10 years about. The incidence of HFRS in spring was higher than other seasons. The constitution of the rodent species was miscellaneous, Rattus norvegicus was the dominant in house,but the dominant in field was Apodemus agrarius . The inapparent infectious rate in epidemic areas was higher than no-epidemic areas. Conclusion Among population of 20-49 years old, men and farmers were main resource of HFRS cases, and HFRS risk of the youngsters would increased. The main source of infection was Rattus norvegicus the pathogen was type Ⅱ HFRS virus. Furthermore the endemic areas was wide-ranging and steady.