Roseola infantum is caused by human herpesvirus types 6 and 7, often manifesting as fever and sudden high fever lasting three to five days. The symptoms and signs are mild, disproportionate to the high fever, with 5%-10% of cases experiencing convulsions. On the third to fifth day of the illness, when the fever suddenly subsides, a scattered rose-colored maculopapular rash appears either simultaneously or slightly later, quickly spreading to the neck and trunk, and resolving within one to two days. This condition occurs in 90% of children under the age of two, although it is occasionally seen in older children and adolescents. Most cases are sporadic, and infection usually results in long-lasting immunity. A second occurrence of the disease is rare.