Last Updated: 2022-04-01
Orf, sheep pox, vaccinoids, livestock pox.
A zoonosis caused by parapoxvirus ovis, a DNA-square virus, with low contagiosity.
- Common disease among sheep farmers
- Self-limiting, but frequent recurrences (an infectious immunity)
- Incubation period: 3-11 days
- Infection occurs via injured skin through direct contact with sheep, lambs and goats. Ecthyma contagiosum occurs mainly in spring.
- Mostly on the extensor sides of the fingers (rarely on the face)
- 1st week: maculopapular stage
- 2nd week: cocard stage
- 3rd week: exudation
- 4th week: formation of a crust
- 5th week: papillomatous transformation, then regression
- Generalisation very rare. Incidental findings often regional lymphadenopathy
Anamnesis, clinic, dermatopathology, virus detection.
Vascular granulation tissue with epidermal ballooned cells and reticular degeneration.
Healing after approx. 5 weeks without scarring.
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