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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.
Rubella, also called German measles or three-day measles, is a contagious viral infection best known by its distinctive red rash.Rubella is not the same as measles (rubeola), though the two illnesses do share some characteristics, including the red rash.However, rubella is caused by a different virus than measles, and is neither as infectious nor usually as severe as measles.The measles-mumps-rubella (MMR) vaccine, usually given to children in the United States twice before they reach school age, is highly effective in preventing rubella.ubella is not the same as measles (rubeola), though the two illnesses do share some characteristics, including the red rash. However, rubella is caused by a different virus than measles, and is neither as infectious nor usually as severe as measles.