Abstract

Sheep infected with the nematode parasite Trichostrongylus colubriformis showed anti- T. colubriformis acetylcholinesterase. (AChE) antibodies in the IgG 1 but not the IgG 2 or IgM fractions prepared from their serum. Using the fluorescent antibody technique with representative sera, antibodies in the IgG 1 fraction exhibited specificity for antigens in the subventral glands of the worm excretory system. IgA antibody specificity for antigens in the excretory glands and intestine of the worm was also demonstrated.

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