A strain of Plasmodium malariae from a patient with congenital quartan malaria was isolated in a splenectomized night monkey, Aotus trivirgatus. After a prepatent period of 100 days, the parasitemia developed to a peak of 97,920 parasites per cmm of blood. The strain is being maintained in splenectomized and intact A. trivirgatus.
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Geiman et al. (1969) studied this question.