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第二次世界大战之前,黑热病在印度的一些邦流行。1958年在流行区内大量喷洒二二三抗疟,使孟加拉、阿萨姆和比哈尔等邦的黑热病消失,但仍有皮肤黑热病的散在发生,这些病人可能起了传染黑热病的保虫宿主作用。当杀虫剂的残效消失后,媒介白蛉的密度就上升。1971年以来,黑热病开始增多,至1976年形成流行。1977年8月进行的流行病学调查,发现比哈尔邦的4个疫区于当年1～8月约有7万例病人,死亡率约7%。据政府估计,比哈尔邦到1977年8月的病人数
Prior to the Second World War, kala-azar prevailed in some Indian states. In 1958, a large number of anti-malaria cases were sprayed in the epidemic area. Anti-malaria in 223 anti-malaria countries such as Bangladesh, Assam and Bihar disappeared but there was still a spread of skin kala-azar. These patients may have nourishing hosts infected with kala-azar effect. As the pesticide residuals disappear, the density of the whitened goose increases. Since 1971, kala-azar began to increase and became popular in 1976. An epidemiological survey conducted in August 1977 found that there were about 70 000 patients in the four affected areas in Bihar between January and August of that year, with a mortality rate of about 7%. According to government estimates, the number of patients in Bihar until August 1977