Roseola ======= þ Roseola Names - Roseola Infantum - Exanthem Subitum þ Roseola Etiology and Epidemiology - caused by Herpesvirus Type 6 þ Roseola History - rash comes on as 3-4 days of fever breaks - Classic History: A 1 year old child develops sudden onset of a very high fever which lasts for 3-5 days and is associated with a cough and runny nose. Just as the fever resolves, the patient suddenly develops a diffuse, truncal, erythematous maculopapular rash.