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− | ==Stephanofilaira stilesi== | + | {{OpenPagesTop}} |
− | *Dermall lesions of cattle in USA
| + | {{Taxobox |
| + | |name =''Stephanofilaira stilesi |
| + | |kingdom = |
| + | |phylum = |
| + | |class = [[Nematodes|Nematoda]] |
| + | |sub-class = |
| + | |order = |
| + | |super-family = [[Filarioidea]] |
| + | |family = |
| + | |sub-family = |
| + | |genus = |
| + | |species = |
| + | }} |
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− | ===Lifecycle=== | + | ==Hosts== |
− | *The infective larvae develop in the horn fly - Haematobia irritans
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− | **Flies ingest microfilaria as they feed on cutaneous lesions.
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− | **Microfilaria develop into L3 larvae in the hornfly over 18-21 days.
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− | **Infective L3 larva are deposited into the skin when the fly bites again, where they grow into adult worms.
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| + | '''Intermediate hosts''': The horn fly, ''[[Haematobia irritans]]'' |
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− | ===Gross pathology===
| + | '''Definitive hosts''': Cattle |
− | *Lesions begin as small circular patches on the ventral midline with serous exudate.
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− | *These enlarge and coalesce producing lesions 25cm or more in diameter.
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− | *Hemorrhage develops along the periphery while the older, central areas develop scabs or dry crusts.
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− | *Healing lesions are alopecic, lichenified plaques.
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− | *Lesions may also occur on the flank, udder, teats, face and neck.
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− | ==Stephanofilaria assamensis== | + | ==Identification== |
− | *'Humpsore'
| + | These small [[Nematodes|nematodes]] are between 3-6mm in length. The eggs have thin shells, and are around 65μm in length. The microfilaria are 50μm long and enclosed in a spherical, vitelline membrane. |
− | *''Bos indicus'' in India
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− | *
| + | ==Lifecycle== |
| + | Horn flies feed on lesions found on the host skin, and ingest microfilariae, as they feed on cutaneous lesions. They later develop into L3 in around 18-21 days. The definitive host is infected when the fly leaves the L3 on the host. |
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| + | Causes [[Stephanofilariasis]]. |
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| + | {{Learning |
| + | |literature search = [http://www.cabdirect.org/search.html?q=title:(%22Stephanofilaria+stilesi%22) ''Stephanofilaria stilesi'' publications] |
| + | }} |
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| + | {{OpenPages}} |
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| + | [[Category:Filarioidea]] |