Exanthem subitum, also known as roseola infantum, is caused by human herpesvirus types 6 and 7. Other viruses such as echovirus, adenovirus, and parainfluenza virus can also cause exanthem subitum. It is most commonly seen in children under the age of two, with the peak incidence occurring between 7 to 13 months. Cases are rare in children younger than three months or older than four years. Exanthem subitum is an acute exanthematous infectious disease, mostly occurring sporadically. After infection, permanent immunity can be acquired. Being an infectious disease, exanthem subitum is contagious. After being in contact with an infected child, a latent period of 5 to 10 days may follow before fever develops.