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Orf is a viral infection transmitted from infected sheep or goats and occasionally from deer or reindeer. The clinical findings are limited to one or more papules and sometimes regional lymphadenitis. The lesion is described as, ". . . a red to violet vesiculonodule, maculopapule or pustule, that progresses to a weeping nodule with central umbilication." Papules may reach 3 cm in diameter and last 3 to 6 weeks. A related condition is milker's nodule caused by a different Parapoxvirus. [CCDM, p. 391-3] Milker's nodules are seen in dairy farmers and veterinarians after contact with infected udders and teats of cattle. [Marks, p. 281] |
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