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某部于1966年10月～1967年1月,发生了一批不明高热病人,防治队在现场作了初步的流行病学调查,情况如下。一般情况部队进驻的地点是安徽西部某县湖泊地区。此地属温带气候,年平均气温为15.7℃,相对湿度为58～80%,年降雨量为485毫米。该湖地处淮河下游南岸,地势低洼。开垦前,夏秋季淮河水位高时,蓄水入湖;冬春季枯水期,部分湖地种植小麦等农作物。当地主要的医学动物、昆虫有:黑线姬鼠、黑线仓鼠、褐家鼠、蚊、蝇、蚤、螨等。居民中的传染病有流行性感冒、流行性脑脊髓膜炎、流行性出血热、钩端螺旋体病、病毒性肝炎、痢疾、伤寒、疟疾、流行性乙型脑炎等。
A certain department from October 1966 to January 1967, a group of unidentified patients with high fever, prevention teams made a preliminary epidemiological survey at the scene, as follows. In general, the location where troops are stationed is in the lake area of a county in western Anhui. This is a temperate climate, the annual average temperature of 15.7 ℃, relative humidity of 58 to 80%, annual rainfall of 485 mm. The lake is located in the lower reaches of the Huaihe River, low lying. Before reclamation, summer and autumn when the Huaihe River water level is high, water storage into the lake; winter and spring dry season, part of the lake to grow wheat and other crops. The main local medical animals, insects are: Apodemus, black hamster, brown house mouse, mosquito, fly, fleas, mites and so on. Infectious diseases among the residents include influenza, epidemic meningitis, epidemic hemorrhagic fever, leptospirosis, viral hepatitis, dysentery, typhoid fever, malaria and Japanese encephalitis.