Difference between revisions of "Myiasis"
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*However, [[Ectoparasiticides|insecticide]] resistance can occur quicker | *However, [[Ectoparasiticides|insecticide]] resistance can occur quicker | ||
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+ | [[Category:Integumentary System - Parasitic Infections]] | ||
[[Category:To_Do_-_Dermatology]] | [[Category:To_Do_-_Dermatology]] |
Revision as of 14:48, 22 February 2011
- Infection by dipterous flies in moist body areas (eg. perineum)
- Commonly affects sheep - ovine fleece rot
- Grossly:
- Matted hair or wool, may be in wounds
- Multiple holes or ulcers
- Malodour
- May result in death due to septicaemia or toxaemia
- Cuterebra myiasis
- Caused by Cuterebra sp
- Young animals come into contact with eggs on stones or plants
- Nodules with larvae in subcutis + respiration openings to surface
- Hypoderma myiasis
- Caused by Hypoderma lineatum or H. bovis
- Mainly affects cattle
- Skin of legs is penetrated -> migration through oesophagus or vertebral canal to subcutis of back
- Cause subcutaneous nodules with respiration openings
- Larvae in cavity with fibrin and eosinophils surrounded by granulation tissue with eosinophil clusters
- Screwworm myiasis
- Occurs in Africa, Asia, Central and South America
- Larvaae are deposited in wounds
- Penetrate and liquify tissue
Pathogenesis
- Production losses
- Annoyance
- Bites can lead to secondary infection by myiasis producing flies and other muscid species
- Disease transmission
- Pathogenic bacteria and viruses via mechanical transmission
- Helminths can be introduced into the host
- E.g. Stephanofiliaria a filarial nemadode found in the skin of cattle overseas
Haematobia irritans
Control
- Resident fly so easier to control than visiting flies as spends more time in contact with the host
- However, insecticide resistance can occur quicker