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The Donaldson Strain of Malaria

3. THE INFECTION IN THE MOSQUITO

The Donaldson strain of malaria was infective to Anopheles quadrimaculatus and to two strains of A. albimanus. A. quadrimaculatus showed the greatest susceptibility and the Panama strain of albimanus the least.

No close correlation could be observed between the day of parasite patency and infectivity to mosquitoes. There was some indication that there may be alternating waves of good and poor infectivity.

There was no orderly relationship between total parasite densities and infectivity to mosquitoes. The infectivity could be positively correlated with the male gametocyte density.

Gametocyte densities in the carrier were generally low, and infectivity to mosquitoes of much less certainty and intensity than with strains of P. vivax.

The extrinsic incubation period required about 15 days at 77°F.

The pigment granules in the oocyst occurred almost invariably in a linear arrangement, often with two lines crossing to produce an X-pattern. The granules were smaller in number and more irregular in shape than P. vivax.

Similarities between the Donaldson strain and P. ovale are discussed.