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Adaptation of the Indochina I/CDC Strain of Plasmodium Falciparum to the Squirrel Monkey (Saimiri Sciureus)

Carlos C. Campbell^*, William E. Collins^*, Wilbur K. Milhous, Jacquelin M. Roberts^** AND Archie Armstead

^* Malaria Branch
^** Division of Parasitic Diseases
Office of Scientific Services, Center for Infectious Diseases, Centers for Disease Control, Atlanta, Georgia 30333
Malaria Laboratory, Division of Experimental Therapeutics, Walter Reed Army Institute of Research Washington, DC 20307

The Indochina I/CDC strain of Plasmodium falciparum was linearly passaged in squirrel monkeys (Saimiri sciureus) of 3 phenotypes. Splenectomized monkeys of Guyanan and Peruvian type developed high density parasitemias, but considerably lower than the mean peak parasitemia (> 10⁶/mm³) in Bolivian phenotype squirrel monkeys. Spleenintact Bolivian and Peruvian squirrel monkeys all developed potentially lethal infections after linear passage of parasites from Saimiri and Aotus. For the evaluation of induced immunity to P. falciparum, the Indochina I/CDC strain in Saimiri will be a valuable model system.

Accepted for publication December 16, 1985.