The periodicity in the development of Plasmodium parasites in infected animals, including man, has been known for almost 100 years. In turn, this periodicity is a consequence of the synchronous maturation of the parasite during its intracellular development. The cyclic fever that characterizes malarial infections is the outward manifestation of the parasite development. Until recently, little was known about the mechanisms by which parasite synchronicity is established and maintained. This review surveys the recent literature bearing on two main questions. (1) What are the mechanisms involved in the process of parasite synchronicity? (2) Do the circadian rhythms of the host interfere with the parasite cycle?
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