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本文报告了莒南县混合型流行性出血热疫区传染源种类，结果表明：疫区的六个鼠种均带ＥＨＦ病毒。冬季野外鼠种带毒各年度平均为４．８％，春季室内鼠带毒各年度平均为８．９％，野外室内各主要宿主动物的带毒逐年增高，病人也明显增多，证明主要传染源带病毒的高低对该地区ＥＨＦ流行起重要作用。隐性感染调查证明，不同职业人群的隐性感染率差异有非常显著意义（Ｐ＜０．０１），以病人家庭成员为最高，从事临床诊疗工作的医务人员最低。
In this paper, the types of infectious agents in epidemic area of epidemic hemorrhagic fever in Junan County were reported. The results showed that all the six murine species in the endemic area were infected with EHF virus. In winter, the average annual incidence of rat poisoning was 4.8% in spring and 8.9% in spring. The annual incidence of poisoning by major host animals in the field increased year by year, and the number of patients was also significantly increased The level of the virus plays an important role in the epidemic of EHF in the area. The investigation of latent infection shows that there is a significant difference in the latent infection rate among different occupational groups (P <0.01), with the highest family members and the lowest medical staff engaged in clinical diagnosis and treatment.