The results showed that the predominant host animal of Dayangshu District was Apodemus agrarius, and presently it has changed to the mixed type of HFRS.

• 结果表明，大杨树地区的疫源地性质是黑线姬鼠为主要宿主动物的肾综合征出血热自然疫源地，目前已演变为姬鼠型为主的混合型疫区。