Main Page | See live article | Alphabetical index Orf is a viral disease primarily in sheep that is caused by a parapox virus. People can contract this disorder by direct innoculation from the mouth of infected sheep and goats. It causes a purulent appearing papule locally and generally no systemic symptoms. The papule may persist for 7 to 10 weeks and spontaneously resolves. It is uncommon and not usually recognized by most practitioners This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.