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Abstract
Lambs were infected orally at 14 weeks of age with either Taenia hydatigena, T ovis
or Echinococcus granulosus eggs. To induce high levels of resistance to oral reinfection,
they were then injected intramuscularly with eggs of the homologous species four weeks
and eight weeks later. The degree of immunity was then tested by oral challenge with
eggs from either the homologous or an heterologous species. Autopsy results indicated
that prior infection with an homologous species induced a very high degree of immunity
to challenge infection. Prior infection with all combinations of heterologous species
resulted in a lesser degree of immunity, which appeared to have acted on the establishment
phase of development and did not influence cyst survival.