The department has begun contacting hundreds of people, many of which are employed at the U.S. Bank building in Milwaukee, who could have made contact with an infected woman, WISN-TV in Milwaukee reported Wednesday.

Dozens of people who commute into the city reportedly were also contacted because the "highly contagious" woman rode the Route 79 "Freeway Flyer" between April 12 and April 23.

"We're asking individuals who receive this messaging to monitor for symptoms, to see their doctor if they have symptoms, and to make sure (they are) up to date on immunizations," said Paul Biedrzycki of the health department.

Rubella, sometimes called the German Measles, can be detected by symptoms such as fever, swollen glands, rash and upper respiratory infection.

Officials said they have confirmed six cases of measles and two cases of rubella in the Milwaukee area.