Rubella (also known as epidemic roseola, German measles, liberty measles or three-day measles) is a disease caused by the Rubella virus.
It is often mild and an attack can pass unnoticed.
However, this can make the virus difficult to diagnose.
The virus usually enters the body through the nose or throat.
The disease can last 1-5 days.
Children recover more quickly than adults.
Like most viruses living along the respiratory tract, it is passed from person to person by tiny droplets in the air that are breathed out.
Rubella can pose a serious risk as it can also be transmitted from a mother to her developing baby through the bloodstream via the placenta.
If the mother is infected within the first 20 weeks of pregnancy, the baby will have congenital rubella syndrome.
The virus has an incubation period of 2 to 3 weeks.