title: Induction of partial resistance in calves to Cooperia spp. by repeated intradermal injections of adult worm extract.
abstract: The effect of repeated intradermal injections of small quantities of adult worm extract on the resistance of calves to Cooperia spp. was investigated. A group of five calves injected intradermally was less resistant than a similar group inoculated twice with infective larvae, but more resistant than a group of five calves kept as worm-free controls. The resistance was reflected by worm numbers, worm lengths, inhibition percentage of L4 larvae, number of eggs per female worm, egg production and by antibody titres.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D001835:Body Weight; D002417:Cattle / Q000276:immunology*; D005243:Feces / Q000469:parasitology; D007113:Immunity, Innate; D007271:Injections, Intradermal; D008297:Male; D010270:Parasite Egg Count; D014020:Tissue Extracts / Q000008:administration & dosage*; D014251:Trichostrongyloidea / Q000276:immunology*; D014252:Trichostrongyloidiasis / Q000276:immunology* / Q000469:parasitology
chemical_list: D014020:Tissue Extracts