Rapid expulsion of Ancylostoma caninum larvae due to previous infection with Hymenolepis nana deshelled eggs.

Mice initially infected with single and repeated doses of Hymenolepis nana deshelled eggs produced rapid and significant expulsion of challenged Ancylostoma caninum larvae. Absolute protective response was observed 8 days after initial infection (at 96 hours after challenge) in both singly and repeatedly infected groups probably due to high titres of heterologous reacting antibodies.