Proteolytic, Antigenic and Immunogenic Properties of Schistosoma mansoni Cercarial Secretion Material *

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Abstract
Schistosoma mansoni cercariae secrete preacetabular gland material in association with skin penetration. The material is heterogeneous and contains proteolytic enzyme(s) which comprise a small proportion of the total protein. We have immunized mice with cercarial secretion material in several protocols designed to induce a variety of antibody responses. The cercarial secretion material is sufficiently immunogenic to induce precipitating and reaginic antibody production. The antibodies obtained were not of the necessary quantity and/or quality to afford protection from a challenge infection.

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