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We present a rare case of hypocomplementaemic urticarial vasculitis in a 1‐year‐old girl with a coxsackievirus type A9 (CA9) infection.
At first, we thought that the patient had Kawasaki disease, but a skin biopsy showed overriding evidence of urticarial vasculitis and serum complement levels were severely reduced. Treatment with prednisolone was effective. We isolated and confirmed CA9 from all samples (nasal fluid, serum and stool). We also analysed CA9 genetically.
CA9 may induce systemic small‐vessel vasculitis resulting in transient decreases in complements.
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