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Title: Use of developmental temperature and gastrointestinal tract location to isolate pure 'Trichostrongylus vitrinus' from mixed, naturally acquired trichostrongylid infections in sheep
Contributor(s): Blackburn, Paul Jonathan  (author); Carmichael, Ian (author); Walkden-Brown, Steve W  (author)orcid ; Greenslade, S (author)
Publication Date: 2015
DOI: 10.1111/avj.12325
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Abstract: Objective: To isolate 'Trichostrongylus vitrinus' from naturally acquired mixed trichostrongylid infections (predominantly 'Trichostrongylus' spp. and 'Teladorsagia circumcincta') in sheep using differential larval development temperatures and the anatomical location of adults. Methods: Faeces were collected from ewes with mixed, naturally acquired trichostrongylid infection, and incubated at low temperatures (4°C or 8°C) for 20-68 days depending on temperature. Harvested infective larvae were passaged through worm-free lambs, from which the first 5m of small intestine was collected and adult worms recovered. Purity of infection with 'T. vitrinus' was assessed by examination of spicules on 100 adult male worms. Eggs of recovered adult female worms were cultured at 25°C and harvested larvae were re-passaged through worm-free lambs. Results: Low temperature incubation (≤8°C) successfully exploited variation in the developmental temperature required by pre-parasitic stages of small intestinal nematodes, allowing 'T. vitrinus' to develop while others did not. Differential organ harvest from infected sheep allowed isolation of 'T. vitrinus' from other gastrointestinal nematodes, with amplification of pure 'T. vitrinus' achieved by passage through a further generation of lambs. Conclusion: A successful method for the isolation of pure T. vitrinus from mixed infections is described. The resulting pure strain of 'T. vitrinus' has been amplified and is held by two institutions for use in research (CSIRO reference SARDI 2011 strain).
Publication Type: Journal Article
Source of Publication: Australian Veterinary Journal, 93(6), p. 221-224
Publisher: Wiley-Blackwell Publishing Ltd
Place of Publication: United Kingdom
ISSN: 0005-0423
Field of Research (FOR): 070708 Veterinary Parasitology
070705 Veterinary Immunology
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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Appears in Collections:Journal Article
School of Environmental and Rural Science

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