Host-Tissue Reactions to Initial and Superimposed Infections with Hymenolepis nana var. fraterna

Abstract

Following initial infections a cellular infiltration was present around the larvae after 72 hours and rather marked at 93-96 hours. In 8 mice given a 2d egg infection after 5 or 10 days, oncospheres penetrated the mucosa in only one animal. The acquired immunity against this parasite may exist in more than one phase.