Adverse effects of viral vaccines Seen in normal Hosts The pathogenesis of which is unclear But which is thought to have an Immunologic Basis Postinfectious or postvaccinal Encephalomyelitis is the classic example Of a disease mediated by cell-mediated Hypersensivity These children fail to develope thr rash Of measles and specific measles Neutralizine antibody and subsequently die Adverse effects of vaccines seen In normal hosts that appear to be Related to the nature of the Antigen or the route of administration