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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.
About Rubella. Rubella â commonly known as German measles or 3-day measles â is an infection that mostly affects the skin and lymph nodes. It is caused by the rubella virus (not the same virus that causes measles). Rubella spreads when people breathe in virus-infected fluid, such as the droplets sprayed into the air when a person with rubella sneezes or coughs, or share food or drink with someone who's infected.