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Induction of Protective Immunity to Plasmodium Falciparum in Saimiri Sciureus Monkeys with Partially Purified Exoantigens

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Journal Infect Immun
Date 1985 Sep 1
PMID 3897052
Citations 9
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Abstract

Soluble Plasmodium falciparum exoantigens in crude culture supernatant fluids induced protective immunity against experimental falciparum malaria in Bolivian Saimiri sciureus monkeys. Susceptible squirrel monkeys were vaccinated with an aluminum hydroxide-fortified fraction purified from culture supernatants of P. falciparum Indochina I and Geneve/SGE-1 by cation-exchange (sulfopropyl-trisacryl) chromatography. Animals immunized with sulfopropyl-purified and corresponding control immunogens were challenged with whole blood containing monkey-adapted virulent organisms of the Indochina I strain. Hematological, serological, and parasitological profiles, including the appearance of crisis forms, served as potential indicators of protection. This immunogen conferred significant clinical protection of squirrel monkeys against needle challenge with the homologous Indochina I strain and a moderate degree of heterologous strain immunity.

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