Trichostrongylus colubriformis and Heligmosomoides polygyrus: relationship between infectivity and exsheathment during ageing of infective larvae.
Infective larvae of two trichostrongyle parasites of the small intestine were stored from 0 to 22 weeks at 24 degrees C for T colubriformis and from 0 to 82 weeks at 4 degrees C for H polygyrus. A loss in infectivity with ageing was observed in vivo as well as a decrease in the exsheathment potential (number of larvae exsheathed in vitro after 20 min of incubation). A linear regression was established between the number of larvae exsheathed in vitro within 20 min and the number of adult worms developed in vivo.
Institut National de la Recherche Agronomique, CR de Tours-Nouzilly, Monnaie, France.
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D000818:Animals; D006369:Heligmosomatoidea / Q000502:physiology*; D007814:Larva / Q000502:physiology; D008297:Male; D051379:Mice; D009349:Nematode Infections / Q000503:physiopathology*; D009351:Nematospiroides dubius / Q000502:physiology*; D012756:Sheep; D012757:Sheep Diseases / Q000469:parasitology; D013997:Time Factors; D014253:Trichostrongylosis / Q000503:physiopathology; D014254:Trichostrongylus / Q000502:physiology*