Definition: sometimes severe, unusual clinical manifestation of natural measles virus infection in people with waning vaccination immunity, particularly in those who had received formaldehyde-inactivated vaccine; an accelerated allergic reaction apparently resulting from an anamnestic antibody response, characterized by high fever, absence of Koplik spots, a shortened prodromal period, atypical rash, and pneumonia.
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Examples: glitazone, GI cocktail, etc.