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党中央在1956年到1967年全國農業發展綱要中,提出要分别在7年或12年內,在一切可能的地方,基本上消滅危害人民健康最嚴重的疾病。黑热病就是其中之一。黑热病在我國分佈很广。長江以北的華东、華北以及东北、西北的許多地方,都發現有这种病。全國各地的患者有数十万。患者中絕大多数是20歲以下的兒童和青少年。黑热病是因利朶氏原虫侵入人体引起的。这种原虫有兩种形态,在昆虫体內时是長形的鞭毛体;在人体內时則呈圆形或椭圓形,直徑約0.002—0.005厘米。
In the Outline of National Agricultural Development from 1956 to 1967, the Party Central Committee proposed to basically eliminate all the diseases that endanger the health of the people, wherever possible, within 7 or 12 years respectively. Kala-azar is one of them. Kala-azar is widely distributed in our country. East China, north China and northeast and northwest of the Yangtze River are found in many places. Hundreds of thousands of patients across the country. The vast majority of patients are children and adolescents under 20 years of age. Kala-azar is caused by the invasion of Leishmania parasite into the human body. This protozoa has two forms, long in the body of insects flagella body; in the human body was round or oval, diameter of about 0.002-0.005 cm.