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Varicella as a trigger of atypical haemolytic uraemic syndrome associated with complement dysfunction: two cases.

We report two cases of children who presented with haemolytic uraemic syndrome following varicella infection. One of them had a membrane cofactor protein mutation, and the other had anti-factor H antibodies. These observations show that infectious agents such as varicella-zoster virus may be the trigger of haemolytic uraemic syndrome in patients with complement dysregulation.