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− | [[Category:Trichostrongyloidea]] | + | {{OpenPagesTop}} |
| + | [[Image:Trichostrongylus.jpg|thumb|right|150px|''Trichostrongylus'' - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]] |
| + | ==Introduction== |
| + | Trichostrongyloidea are a bursate [[Nematodes|nematodes]], with ''[[Dictyocaulus]]'' forming the only exception. Important genera include ''[[Ostertagia]]'', ''[[Haemonchus]]'' and ''Trichostrongylus.'' |
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| + | == General Life-Cycle == |
| + | The life cycle of Trichostrongyloidea is direct, and infection is through ingestion of L3. |
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| + | The egg is approximately 80µm long, oval, thin-shelled, and containing 4-16 cells, so is a typical strongyle egg. |
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| + | Egg → L1 → L2 → L3 occurs on the ground. L1 and L2 feed on bacteria, and L3 is exsheathed and represents the infective stage. L3 cannot feed, but do contain a finite amount of stored food to provide energy for movement. Infection is via ingestion of the L3. L3 → L4 → adult, these stages generally occur in the stomach or small intestine. |
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| + | Parasitic development initially occurs in gastric glands or intestinal crypts, species dependent. Adults are generally found on the mucosal surface, and the prepatent period is typically about 3 weeks. |
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| + | {{Learning |
| + | |literature search = [http://www.cabdirect.org/search.html?q=id:(%22Trichostrongyloidea%22)+AND+title:(%22life+cycle%22) Trichostrongyloidea life cycle publications] |
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| + | {{review}} |
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| + | {{OpenPages}} |
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| + | [[Category:Trichostrongyloidea|A]] |
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| + | [[Category:Expert Review]] |