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. 1987 Dec;84(23):8647–8651. doi: 10.1073/pnas.84.23.8647

In vivo testing of subunit vaccines against malaria sporozoites using a rodent system.

A A Lal 1, V F de la Cruz 1, M F Good 1, W R Weiss 1, M Lunde 1, W L Maloy 1, J A Welsh 1, T F McCutchan 1
PMCID: PMC299603  PMID: 3479809

Abstract

To test the putative in vivo protective effects of antibodies to circumsporozoite (CS) protein repeats against malarial infection, different strains of mice were immunized against various repetitive regions of the Plasmodium yoelii CS protein in the form of synthetic peptides conjugated to keyhole limpet hemocyanin. Complete Freund's adjuvant or saponin was used as adjuvant. When vaccinated mice were challenged with 500 sporozoites almost all animals became infected. There were no significant protective effects in vaccinated versus unvaccinated mice. Furthermore, there was no correlation between the antibody titer to the CS repeats and infection. The parasites from infected animals were shown to encode a CS protein containing the same repeats as those used for immunization, indicating that the infections were not due to selection for variant parasites. These experiments demonstrate that antibodies to the CS repeats, as derived in vivo with peptides, despite being surface reactive, do not provide protection against sporozoite challenge in vivo. This conclusion is in contrast to previous conclusions based on studies showing protection by way of in vitro sporozoite neutralization procedures and passive transfer of monoclonal antibody.

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These references are in PubMed. This may not be the complete list of references from this article.

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