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从人体感染疟原虫到发病(口腔温度超过37.8℃),称潜伏期。潜伏期包括整个红细胞外期和红细胞内期的第1个繁殖周期。一般间日疟、卵形疟14 d,恶性疟12 d,三日疟30 d。感染原虫量、株的不一,人体免疫力的差异,感染方式的不同均可造成不同的潜伏期。温带地区有所谓长潜伏期虫株,可长达8～14个月。输血感染潜伏期7～10 d。胎传疟疾,潜伏期就更短。有一定免疫力的人或服过预防药的人,潜伏期可延长。
Infection from the human body to the incidence of Plasmodium (oral temperature over 37.8 ℃), said the incubation period. Including the entire incubation period of erythrocytic and erythrocytic end of the first breeding cycle. The common vivax malaria, oval malaria 14 d, falciparum malaria 12 d, malaria day 30 d. The number of protozoa infected, different strains, human immune differences, different ways of infection can cause different incubation period. Temperate zone so-called long-latency worm, up to 8 to 14 months. Transfusion infection incubation period of 7 ~ 10 d. Childbirth malaria, the incubation period is even shorter. People who have some immunity or who have taken preventive medicine may have an extended incubation period.