The rubella vaccination program, started in 1969, had helped eliminate rubella from the U.S. as of 2004. As the CDC describes, the last major rubella epidemic in the United States took place from 1964 to 1965, five years before the rubella vaccination program began. The rubella virus is still spreading in certain parts of the world that, surprise, surprise, don't routinely give children the rubella vaccine. A single person infected with the rubella virus can then on average infect anywhere between 3 and 12 people who are not protected against the rubella virus, in other words, not vaccinated. Therefore, it will also be important to prevent the rubella virus from circulating by making sure that everyone else is vaccinated.

Source: Forbes February 03, 2019 18:39 UTC