The relation of the endo-erythrocytic cycle of Plasmodium knowlesi and of P. cynomolgi to body temperature

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Abstract
The endo-erythrocytic cycle of malaria parasites is presumably synchronized and controlled by some stimuli supplied by the 24-hr. cycle of the host (although its absolute duration, 24, 48 or 72-hr. is determined by the time required for development from merozoite to schizont). An investigation was made to see whether this controlling stimulus was provided by the temperature cycle of the host (as is the case with certain microfilariae). However, moderate lowering of the body temperatures of monkeys during the day, or moderate raising during the night, did not significantly alter the duration of the end-erythro-cytic cycles of P. knowlesi or of P. cynomolgi. The endo-erythrocytic cycle of plasmodia is discussed in terms of modern theories of cell division.

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