Species Specific and Cross-protective Functional Antigens of the Tapeworm Embryo

Abstract

EVIDENCE¹ has been reported which supports the hypothesis that at least two immune responses may occur to larval taeniid tapeworms in the intermediate host, and that both responses can be elicited by a single parenteral injection of homologous viable eggs or activated embryos. The initial response appears to prevent the establishment of the challenge infection at the site of election, possibly by preventing the invading embryo from penetrating the intestinal barrier. The later response occurs at the site of election against the growing metacestode.