Stephanofilaria stilesi
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Stephanofilaira stilesi
- Dermall lesions of cattle in USA
Lifecycle
- The infective larvae develop in the horn fly - Haematobia irritans
- Flies ingest microfilaria as they feed on cutaneous lesions.
- Microfilaria develop into L3 larvae in the hornfly over 18-21 days.
- Infective L3 larva are deposited into the skin when the fly bites again, where they grow into adult worms.
Gross pathology
- Lesions begin as small circular patches on the ventral midline with serous exudate.
- These enlarge and coalesce producing lesions 25cm or more in diameter.
- Hemorrhage develops along the periphery while the older, central areas develop scabs or dry crusts.
- Healing lesions are alopecic, lichenified plaques.
- Lesions may also occur on the flank, udder, teats, face and neck.
Stephanofilaria assamensis
- 'Humpsore'
- Bos indicus in India