German MEASLES is a term used to refer to three different illnesses: RUBELLA, Roseola, and MEASLES. RUBELLA, also known as German MEASLES, is a contagious viral infection that causes a mild rash and fever. Roseola is a viral infection that usually affects young children and is characterized by a high fever and a rash. MEASLES is a highly contagious viral infection that can cause serious complications, including pneumonia and encephalitis. All three of these illnesses are caused by different viruses and have different symptoms, but they are all referred to as German MEASLES.