众所周知,某些间日疟原虫虫株有延长潜隐期的现象,许多秋季感染者至次年春季才发病。这类虫株,在温带地区特别常见,而在热带地仅偶而见到。四十年来认为潜伏期的延长可能是由于感染性蚊虫叮咬时的少量子孢子所致。本文作者在采用疟疾疗法治疗精神病患者时,分别用不同数量的北朝鲜株 It is well-known that some strains of Plasmodium vivax have the potential to prolong their latent period, and many fall infections are not affected until the following spring. These insect strains are particularly common in temperate regions, but occasionally seen in the tropics. For forty years, the extension of incubation period is thought to be due to a small number of sporozoites in infectious mosquito bites. When the author of this article treated malaria patients with psychosis, they used different numbers of North Korean strains