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疟疾典型的隔天或隔二天发作,系该种原虫红内裂体增殖周期同步化的反映。周围血内如有两批虫,则每天发热;若完全不同步,发热也随之不规则。一般认为,可以排除同步化是一只蚊叮咬的结果,因为疟疾首次发热常不规则,待发热数次后才渐趋规则。说明同步化很可能是宿主与寄生虫相互作用的结果。对同步化的原因,作者提出几个与过去不同的假说。
A typical malaria outbreak every other day or every other day is a reflection of the synchronization of the proliferative cycle of the red fission body of the protozoan. If there are two groups of worms around the blood, the daily fever; if completely out of sync, fever also will be irregular. It is generally believed that synchronization can be ruled out as a result of mosquito bites because malaria is often irregular for the first time and tends to become regular after several episodes of fever. Synchronization is likely to be the result of host-parasite interactions. For the reason of synchronization, the author proposes several different hypotheses from the past.