Volume 51, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



monkeys were immunized with the form of the merozoite apical membrane antigen-1 produced using the baculovirus expression system and combined with Montanide ISA 720 adjuvant. Following three immunizations, monkeys were challenged with 10,000 trophozoite parasites. Antibody titers determined by fluorescence microscopy indicated an enhanced response following the second immunization. Four of five control animals had parasite counts > 5% 18–26 days following challenge. Four of five immunized monkeys had reduced levels of maximum parasitemia or delays in accumulated parasite counts, suggestive of protection. Rechallenge of the animals with resulted in three of four adjuvant control animals developing patent parasitemia whereas none of five immunized animals were infected, suggesting some level of heterologous protection.


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