Also known as roseola infantum, exanthem subitem, and pseudorubella. An acute disease of infants or very young children caused by HHV-6 and characterized by high fever and a skin rash.
Exanthem subitum (meaning sudden rash), also referred to as roseola infantum (or rose rash of infants), sixth disease and (confusingly) baby measles, or three day fever, is a benign disease of children, generally under two years old, whose manifestations are usually limited to a transient rash ("exanthem") that occurs following a fever of about three day's duration.