Why was her varicella serology checked ?
This child has Oligo-articular JIA.
One third of children with this JIA subtype may develop a polyarticular course (if this happens after 6 months, then it is called Extended Oligoarticular JIA), and warrant systemic immunosuppression (with methotrexate or may progress to a biologic). If varicella negative then varicella vaccination would be recommended in case she needs to have methotrexate in the future. The vaccine would be contraindicated when on methotrexate. Varicella infection can be serious in children who are immunosuppressed.
The photograph below shows zoster infection in a child who is immunosuppressed.
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