Final answer:
Roseola is a mild viral infection caused by human herpesvirus-6 (HHV-6) that primarily affects young children. It is spread through direct contact with an infected person's saliva or respiratory secretions. The disease presents with a high fever and a characteristic rash on the chest and abdomen.
Step-by-step explanation:
Roseola, also known as roseola infantum or exanthem subitum, is a mild viral infection caused by human herpesvirus-6 (HHV-6). It is most commonly found in young children. Roseola is spread through direct contact with the saliva or respiratory secretions of an infected person. Symptoms include a high fever followed by the appearance of a rash on the chest and abdomen. The disease usually resolves without treatment within a week after the fever develops.