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What is roseola?
Roseola is a mild illness caused by either one of two viruses. Characteristically, roseola has a sudden onset and relatively short duration. Roseola is most common in children 6-24 months of age, with the average age around 9 months. Less frequently, older children, teens, and (rarely) adults may be infected.
Picture of the roseola rash; SOURCE: Fitzpatrick's Dermatology in General Medicine. Klaus Wolff, Lowell A. Goldsmith, Stephen I. Katz, Barbara A. Gilchrest, Amy S. Paller, David J. Leffell. Seventh Edition. Copyright 2008, 2005, 2001, 1997, 1993 by The McGraw-Hill Companies. All rights reserved.