Investigation on Epidemic Focus of EHF in the Mountain Areas of Qingyang County

Objective In order to understand epidemic focus of EHF in the mountain areas of Qingyang county, basic data were analyzed. Methods The density and proportion of mice were investigated. Inapparent infection of natural population and mice blood EHF V-IgG, mice lung EHF V-Ag were detected with IFA. EHF V was isolated from mice lung. Results The density of mice at mountain areas was 13.6%. 10.7% at inhabitant areas. Rattus niniventer was the dominant species in the field on the top area of the mountains. R. flavipectus was the dominant species in inhabitant area on the top of the mountains. A. agrarius was the dominant species in the field on the foot of the mountains and R. norvegicus was the dominant species at inhabitant areas on the foot of the mountains. The rate of inapparent infection of natural population was 3.7%. EHF V carried rate of the mice from the top of the mountains was 2.3%. Total infection rate was 9.3%. The carried rate of mice from the foot of the mountains was 7.4%. Total infection rate was the same as the carried rate. EHF V carried rate of mice from inhabitant areas was 6.3%. Total infection rate was 8.3%. A strain of EHF V was isolated from the lung of R. nitidus. Conclisions It was proved that epidemic focus of EHF in the mountain areas of Qingyang county were still exist and A. agrarius, Rattus niniventer and R. norvegicus were the main source of infection.