1998年我省遭受了百年不遇的特大洪涝灾害 ,生态环境受到了严重破坏 ,我们于1 998年 8～ 9月对未受灾的黑河地区管辖的两个县、两个农场和一个金矿 ,受灾较重的齐齐哈尔地区管辖四县一区进行宿主动物监测 ,结合鼠密度、鼠种构成、鼠带毒率和鼠感染率 ,预测了ＨＦＲＳ的流行趋势 In 1998, our province suffered from unprecedented catastrophic floods and devastating ecological environment. From August to September 1998, we investigated two counties, two farms and one gold mine under the jurisdiction of the unheated Heihe region, Host animal monitoring was conducted in four counties and one district under the jurisdiction of the heavy Qiqihar region. The prevalence of HFRS was predicted based on the mouse density, the composition of the mice, the virulence rate of the mice and the infection rate of the mice