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13 Cards in this Set
- Front
- Back
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Genera of Trichostrongyles in the small intestine |
Trichostrongylus Cooperia Nematodirus |
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Common name and main host for members of Cooperia genus |
Wire-worm Cattle |
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Species of Cooperia genus |
C. oncophora C. surnabada C. pectinata C. punctata C. curticei |
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Which species occur in cattle? |
C. oncophora, C. surnabada (temerate) C. pectinata, C. punctata (sub-tropical) |
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Which species occur in sheep? |
C. curticei |
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Hosts and location of Cooperia |
Cattle, sheep Small intestine |
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Features of Cooperia |
Size: 9mm (second smallest after Trichostrongylus genus) Small cephalic vesicle Transversely striated cephalic dilation Longitudinal cuticular body ridges Spicules: wing-like expansion in the middle region with ridges No gubernaculum (present in Trichostrongylus) |
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Life cycle of Cooperia |
Direct L3 burrows in mucosal glands in SI L4 has head in gland, body in lumen Adult in lumen, braced against villi |
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Pre-patent period |
15 days |
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Hypobiosis |
Prominent Temporary cessation of development of L4 within the host Due to conditions of the environment |
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Effect of Cooperia on the host |
Nematodes 'brace' themselves against villi Cause mild villus atrophy, erosion of epithelium Burdens of 50,000 or more cause anorexia and diarrhoea |
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Immunity |
Occurs following infection Little studied Adults that are immune don't show clinical signs but act as carriers |
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Epidemiology |
Ingest larvae during wet season (summer or winter) |
