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Human Orf: An Under-recognized Entity.

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Summary
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Orf, a zoonotic disease caused by the ORFV virus, typically affects sheep and goats but can transmit to humans, often presenting as hand lesions in animal handlers. Prompt diagnosis based on clinical signs and history prevents unnecessary treatments, as the condition usually resolves spontaneously.

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Area of Science:

  • Dermatology
  • Virology
  • Occupational Health

Background:

  • Orf, caused by the Orf virus (ORFV), is a contagious zoonotic disease endemic in sheep and goats.
  • Human infection occurs through direct contact with infected animals or contaminated fomites, posing an occupational risk to farmers, shepherds, and veterinarians.

Observation:

  • A 59-year-old woman presented with painful hand lesions exhibiting a targetoid appearance with central umbilication and a violaceous halo.
  • The patient had recent contact with goats exhibiting lesions and did not use protective gloves.
  • Histopathology revealed characteristic epidermal and dermal changes, including eosinophilic intracytoplasmic inclusions.

Findings:

  • The case was diagnosed as human Orf based on clinical presentation, occupational history, and characteristic histological findings.
  • Orf lesions progress through six distinct clinical stages over approximately 6-8 weeks.
  • The condition is typically diagnosed clinically, with differential diagnoses including milker's nodule and cutaneous anthrax.

Implications:

  • Early diagnosis of Orf prevents unnecessary investigations and overtreatment, reassuring patients about the condition's benign nature.
  • While Orf usually resolves spontaneously, preventive measures like wearing gloves and proper hygiene are crucial for at-risk populations.
  • Hand involvement in Orf can cause significant morbidity, impacting professionals' productivity and quality of life, highlighting the need for preventative strategies.