Wednesday, June 12, 2024

Orf

Background

Orf, also known as ecthyma contagiosum, contagious pustular dermatitis, infectious labial dermatitis, scabby mouth, or sore mouth, is a viral disease first described in humans in 1934 by Newson and Cross.
It is endemic in sheep and goat herds worldwide but can be found in other ruminants. It causes skin lesions on lips, muzzle, ears, eyelids, nostrils, and, less commonly in genitalia, udders, and feet of infected animals.
Orf is transmitted to humans through direct contact with an infected animal or, less commonly, contaminated fomites. Although extremely rare, human-to-human transmission has been reported. Lesions occur most commonly on the hands. Orf is frequently seen in ranching communities
and in those who process the animals for consumption. It typically has a self-limited course with spontaneous resolution in 4-8 weeks after progressing through distinct stages. A typical clinical presentation of a reddish weeping nodule of orf located on the thumb is shown in the image below.

An early lesion of orf (papular stage).

An early lesion of orf (papular stage).

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