特拉伊原来疟疾严重流行。1947～1949年开始有3批移民进入该地,并联合建立了全国灭疟规划(NMEP)的一个机构,采用室内杀虫剂喷洒措施,到60年代中期消灭了疟疾。抗疟工作导致工农业迅速发展,大片丛林变成了农田。60年代末,特拉伊和其他地区一样疟疾普遍回升,1977年执行了修改的 Tray had a serious epidemic of malaria. Three batches of immigrants entered the area from 1947 to 1949 and jointly established a National Agency for Malaria Control (NMEP) with indoor spraying of pesticides to eradicate malaria by the mid-1960s. Anti-malarial work led to the rapid development of industry and agriculture, a large jungle into a farmland. In the late 1960s, there was a general rebound in malaria in Terai, as in other regions, and in 1977 it was revised