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An unusually severe form of varicella zoster virus (VZV) infection. In the majority of the cases, especially in children, varicella is a very mild infection characterised by skin lesions, low grade fever and malaise. Severe infection is characterized by manifestions including VZV pneumonia, hepatitis, meningitis, and disseminated varicella. [PMID:21748081, PMID:23248376]
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