Studies on Malaria in Chimpanzees. V. The Sporogonous Cycle and Mosquito Transmission of Plasmodium vivax schwetzi

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Abstract
A study of P. v. schwetzi in Anopheles gambiae is described. The sporogonous cycle requires 10 days at 75[degree]-80[degree]F. The pigment pattern in the 4- and 5-day-old oocysts exactly resembles that of P. vivax at a similar stage. Mature oocysts have an average diameter of 57.0 [mu] on the 9th day and 60.6 [mu] on the 10th day after feeding. There is an almost complete loss of sporozoites after release from the oocysts and the salivary glands of A. gambiae are very scantily infected. Despite this, transmission by sporozoites was successful. It is concluded that A. gambiae is not a suitable host or natural vector of P. schwetzi. It is proposed that the benign tertian malaria parasite of man be referred to as Plasmodium vivax vivax when necessary, and the benign tertian malaria parasite of chimpanzees as P. v. schwetzi.

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