Abstract
A ring-infected erythrocyte surface antigen (RESA) has been detected by modified immunofluorescence assay in erythrocytes infected with the simian malaria parasite, Plasmodium fragile. This RESA, of M r 95,000, shares many characteristics with the RESA initially found in the human malaria parasite P. falciparum. Both antigens are found in the membrane of erythrocytes infected with young asexual parasite stages, in merozoite-enriched preparations, and in parasite culture supernatant. Since the RESA of P. falciparum has been shown to confer protective immunity and since P. fragile infection of rhesus monkeys mimics P. falciparum infection in humans, the finding of a RESA in P. fragile underlines the importance of this species as an animal model for antimalarial vaccines.
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