Indexed on: 01 Dec '72Published on: 01 Dec '72Published in: Parasitology Research
Three factors which may influence the excystation of Hymenolepis microstoma cysticercoids have been studied. Age differences between 13 and 149 days do not seem to affect the mechanism of the vital step from larva to adult. As to the influence of the population density a highly significant difference has been found between the very initial excystation speeds of the groups “1–10” and “60–80 larvae per beetle”. However, after 6 min the excystation percentages were practically similar. It has further been demonstrated that pre-treatment of cysticercoids with pepsin is not essential in vitro, but that when applied it has a low to an important enhancing effect depending on the duration.