what is rubella
Knowledge center. Rubella, also known as German measles, is an infectious disease caused by the rubella virus. The virus passes from person-to-person via droplets in the air expelled when infected people cough or sneeze-the virus may also be present in the urine, feces and on the skin.ubella is caused by an extremely infectious virus that is transmitted from person-to-person in droplets in the air. When an infected person sneezes or coughs, those nearby are at risk of becoming infected.