Three-day-fever (roseola infantum) Symptoms A child with three-day-fever has a high fever for three days and a pink rash covers their body.
Roseola is a common disease of babies or young children, in which several days of very high fever are followed by a characteristic rash.
Roseola is an extraordinarily common infection, caused by a virus.
The most common age for a child to contract roseola is between six and twelve months.
About 85 percent of the time, roseola is caused by a virus called human herpesvirus 6 (HHV-6).