Erythema multiforme after orf virus infection

Area of Science:

• Dermatology
• Virology
• Pediatrics

Background:

• Orf disease, caused by parapoxvirus, typically presents with localized skin lesions.
• Erythema multiforme is an immune response often triggered by infections, characterized by target-shaped lesions.
• Co-occurrence of orf and erythema multiforme is uncommon, particularly in pediatric cases.

Observation:

• A 6-year-old boy presented with a crusted nodule on his finger and multiple, target-shaped lesions.
• The patient had recent contact with sheep and goats, a known risk factor for orf.
• Clinical suspicion of orf disease with erythema multiforme was raised.

Findings:

• Microscopy confirmed the presence of parapoxvirus in the primary orf lesion.
• The clinical presentation and diagnostic findings supported a diagnosis of orf-induced erythema multiforme.
• This represents a rare complication of orf infection in a pediatric patient.

Implications:

• The findings suggest a potential link between orf virus DNA and the development of erythema multiforme.
• This case highlights the importance of considering orf disease in children with unusual dermatological presentations after animal contact.
• Further research may elucidate the precise mechanisms underlying orf-induced erythema multiforme.