Children
Bacterial superinfection (impetigo, furunculitis, cellulitis, erisepelas, purpura fulminans, necrotising fasciitis)
Neurological (Reye's syndrome, acute cerebellar ataxia, encephalitis, meningitis, myelitis, polyradiculitis)
Reactive complications (myocarditis, GN, Henoch-Scholein purpura, appendicitis, pancreatitis, orchitis, arthritis,
optic neuritis, iritis, keratitis)