INTERFERENCES BETWEEN ANTHELMINTICS AND IMMUNITY IN OVINE GASTROINTESTINAL STRONGYLOSIS

  • 1 January 1985
    • journal article
    • research article
    • Vol. 16  (1) , 17-23
Abstract
Groups of similar sheep (breed, sex, age, Hb type, family) were immunized against H. aemonchus contortus by repeated infections. Self-cure and immune reactions expelled parasites but some of them still remain in the gut of animals; they have been expelled by anthelmintics. Animals were challenged; a discrepancy exists between the numbers of eggs passed in each group (immune drenched animals, immune non-drenched animals and non-immune animals); the best fitting estimated equation on experimental values (or on moving average points) is used for statistical tests. Immunity vanishes partly (or totally) when animals have been drenched; a residual population of worms is thought to be responsible for immunity because of a permanent booster.

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