Taenia hydatigena. II. Evagination of cysticerci and establishment in dogs

Conditions in vitro producing high rates of evagination of the cysticercus of Taenia hydatigena were obtained with an enzyme mixture of either 100 nig trypsin or 100 mg pancreatin and 5 ml whole dog bile made up to 100 ml with Hanks' balanced salt solution (BSS). Single enzyme solutions, or whole bile, in Hanks' BSS were not efficient. A pretreatment with an acid pepsin solution had little effect, on the rate of evagination. Evagination in vivo took place in the small intestine where a large portion of the larval tissue was shed almost immediately. There was no significant relationship between the mean weight of cysticerci fed to dogs AND the mean weight of scoleces recovered after 24 hr or 20 days.