Rubella is an acute infectious disease primarily caused by the rubella virus, which can lead to a series of symptoms following infection. It can be transmitted from mother to child, as the rubella virus can pass to the fetus through the placenta. Additionally, it can be transmitted through airborne respiratory droplets commonly found in the environment. Patients with rubella have a high concentration of the virus in their saliva. When they talk, cough, or sneeze, virus-laden droplets are produced. When ordinary people inhale these droplets, they may contract the disease. Rubella is self-limiting, and most cases are mild and can fully recover on their own.