正阳县为我省流行性出血热(简称出血热)的老疫区,1963年首发于该县的王勾桥乡。1980年后,发病人数逐年增加,发病范围不断扩大。1985年入冬以来,该县出现了出血热的暴发流行。为查清流行的原因,地、县立即组织调查组进行了流行病学、血清学和传染源调查。现将调查结果报告于后。 Zhengyang County epidemic of hemorrhagic fever in our province (referred to as hemorrhagic fever) of the old epidemic area, starting in 1963 in the county Wang Qiaoqiao Township. After 1980, the number of patients increased year by year, the scope of the disease continues to expand. Since the winter of 1985, an outbreak of haemorrhagic fever has emerged in the county. To find out why the epidemic, prefectures and counties immediately organized an investigation team conducted epidemiological, serological and infectious sources survey. Now report the findings later.