Onchocerca cervicalis (2) Flashcards
1
Q
What are the intermediate hosts?
A
Culicoides spp.
2
Q
Describe adults
A
Slender
2-6 cm in length
Adults found tightly coiled in tissue nodules
- Predilection site: ligamentum nuchae in region of withers
3
Q
Describe the life cycle
A
Culicoides spp.
Indirect
None inhabit the alimentary tract
All depend on insect vectors (IH)
Usually lay larvae (Mff) which develop to L3
4
Q
What are the sites of infection?
A
Adults - coiled in tissue nodules
Mff - in tissue spaces of skin
5
Q
Describe the Pathogenesis
A
Fibrous tissue to develop
Mff result in pruritic dermatitis
- Microfilarial pityriasis (disease characterized by fine scales)
6
Q
How do you diagnose?
A
Mff recovered in a saline incubation of skin biopsies
7
Q
What are the final hosts?
A
All equids
