Difference between revisions of "Strongylus vulgaris"
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===Identification=== | ===Identification=== | ||
| − | The adult worms are dark red | + | The adult worms are dark red. The male has a well developed buccal capsule. Both the male and the female worms have rounded teeth, which enable them to hold onto the intestinal mucosa. |
| − | Both the male and the female worms have rounded teeth, which enable them to hold onto the intestinal mucosa. | ||
The eggs are 100μu x 50μm. | The eggs are 100μu x 50μm. | ||
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The ''S. vulgaris'' eggs are shed in the faeces. Under optimal conditions of high humidity and temperatures over 10 degrees, the eggs will transform into rhabditiform L1 larvae within a few days. | The ''S. vulgaris'' eggs are shed in the faeces. Under optimal conditions of high humidity and temperatures over 10 degrees, the eggs will transform into rhabditiform L1 larvae within a few days. | ||
| − | They then transform into L2, and subsequently L3 without leaving the parasite envelope. L3 are ingested by the host when feeding on pasture. L3 enter the small intestine, where they shed their envelope, and then begin migration across the muscosal surface, where they | + | They then transform into L2, and subsequently L3 without leaving the parasite envelope. L3 are ingested by the host when feeding on pasture. L3 enter the small intestine, where they shed their envelope, and then begin migration across the muscosal surface, where they transform into L4. |
L4 reach the arterioles of the intestine. Around 2 weeks after the eggs were first ingested they reach the colic and caecal arteries, and then finally the cranial mesenteric artery. | L4 reach the arterioles of the intestine. Around 2 weeks after the eggs were first ingested they reach the colic and caecal arteries, and then finally the cranial mesenteric artery. | ||
| − | L4 then transforms into the immature adult and returns to the L1 via the blood vessels. Here they form nodules on the wall of the caecum, and | + | L4 then transforms into the immature adult and returns to the L1 via the blood vessels. Here they form nodules on the wall of the caecum, and occasionally the colon, and are then released into the lumen. |
The prepatent period for ''S. vulgaris'' is 6-7 months. | The prepatent period for ''S. vulgaris'' is 6-7 months. | ||
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[[Category:Strongyloidea]] | [[Category:Strongyloidea]] | ||
[[Category:To_Do_-_Max]] | [[Category:To_Do_-_Max]] | ||
| + | [[Category:To_Do_-_Review]] | ||
Revision as of 09:53, 15 July 2010
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This article is still under construction. |
Introduction
Strongylus vulgaris is a clinically important parasite causing verminous arteritis and was a very common cause of colic in horses. Its prevalence has been on the decrease since the use of wormers containing ivermectin.
Scientific Classification
| Kingdom | Animalia |
| Phylum | Nematoda |
| Class | Chromadorea |
| Order | Rhabditida |
| Family | Strongylidae |
| Genus | Strongylus |
| Species | S. vulgaris |
Identification
The adult worms are dark red. The male has a well developed buccal capsule. Both the male and the female worms have rounded teeth, which enable them to hold onto the intestinal mucosa.
The eggs are 100μu x 50μm.
Life cycle
The S. vulgaris eggs are shed in the faeces. Under optimal conditions of high humidity and temperatures over 10 degrees, the eggs will transform into rhabditiform L1 larvae within a few days.
They then transform into L2, and subsequently L3 without leaving the parasite envelope. L3 are ingested by the host when feeding on pasture. L3 enter the small intestine, where they shed their envelope, and then begin migration across the muscosal surface, where they transform into L4.
L4 reach the arterioles of the intestine. Around 2 weeks after the eggs were first ingested they reach the colic and caecal arteries, and then finally the cranial mesenteric artery.
L4 then transforms into the immature adult and returns to the L1 via the blood vessels. Here they form nodules on the wall of the caecum, and occasionally the colon, and are then released into the lumen.
The prepatent period for S. vulgaris is 6-7 months.