Roseola is also known as roseola infantum, exanthem subitum, sixth disease and three-day rash. The disease is most common in those aged 6 months to 3 years. It is rare in adults, probably because childhood infection gives lifelong immunity to most people. It is usually caused by a virus called human herpesvirus type 6 (HHV-6). It may also be caused by human herpesvirus type 7 (HHV-7).
This is a companion discussion topic for the original article at https://patient.info/infections/roseola