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Roseola (roseola infantum) is a mild illness caused by a virus. It is generally harmless and is most common in children 6 months to 2 years of age. It is rare after age 4. Roseola is caused by two common viruses.
Roseola is caused by the human herpes virus type 6 (HHV-6). Roseola is contagious and spreads through tiny drops of fluid from the nose and throat of infected people, often before they have developed symptoms.