A common viral infection in young children that may cause high fever and a rash.

Roseola is a generally mild infection caused by 2 strains of herpes virus. It's common, usually affecting children by age 2. Adults can get it too, but that's not common.

Symptoms include several days of high fever, followed by a rash. The rash may appear as many small spots.

Treatment includes bed rest, fluids, and medicine to reduce fever.