Infection of Chimpanzees with the Uganda I/CDC Strain of Plasmodium malariae

William E. Collins Malaria Branch, Division of Parasitic Diseases, Center for Infectious Diseases, Centers for Disease Control, Yerkes Regional Primate Research Center, Emory University, Atlanta, Georgia

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Harold M. McClure Malaria Branch, Division of Parasitic Diseases, Center for Infectious Diseases, Centers for Disease Control, Yerkes Regional Primate Research Center, Emory University, Atlanta, Georgia

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Elizabeth Strobert Malaria Branch, Division of Parasitic Diseases, Center for Infectious Diseases, Centers for Disease Control, Yerkes Regional Primate Research Center, Emory University, Atlanta, Georgia

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Valerie Filipski Malaria Branch, Division of Parasitic Diseases, Center for Infectious Diseases, Centers for Disease Control, Yerkes Regional Primate Research Center, Emory University, Atlanta, Georgia

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Jimmie C. Skinner Malaria Branch, Division of Parasitic Diseases, Center for Infectious Diseases, Centers for Disease Control, Yerkes Regional Primate Research Center, Emory University, Atlanta, Georgia

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Peggy S. Stanfill Malaria Branch, Division of Parasitic Diseases, Center for Infectious Diseases, Centers for Disease Control, Yerkes Regional Primate Research Center, Emory University, Atlanta, Georgia

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Bettye B. Richardson Malaria Branch, Division of Parasitic Diseases, Center for Infectious Diseases, Centers for Disease Control, Yerkes Regional Primate Research Center, Emory University, Atlanta, Georgia

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Carla Morris Malaria Branch, Division of Parasitic Diseases, Center for Infectious Diseases, Centers for Disease Control, Yerkes Regional Primate Research Center, Emory University, Atlanta, Georgia

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Nine splenectomized chimpanzees were infected with the Uganda I/CDC strain of Plasmodium malariae. Two had no history of previous malarial infection, whereas 6 had been infected with P. vivax and 1 with P. vivax and P. ovale. The animals with no previous infection had maximum parasitemias of 8,740 and 10,800/mm3. The other animals had maximum parasite counts of 930–75,700/mm3. Anopheles freeborni, An. stephensi, An. dirus, An. maculatus, An. quadrimaculatus, An. culicifacies, An. arabiensis, and An. gambiae were readily infected by feeding through membranes on heparinized blood from these animals.

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