(KMOV) -- Public health officials are warning people to be on alert and look for symptoms of the measles which could have been spread by riding mass transit.
"Measles is the most contagious of the vaccine preventable diseases,” Dr. Greg Wallace said. “So if you aren't vaccinated and exposed to somebody who has measles, you have better than a 90 percent chance of getting the disease."
Each year there are about 60 cases of measles in the U.S which is the second largest number since the disease was eliminated in 2000. However, last year more than 180 people had the disease.
Public health officials say a student from the University of California, Berkeley could have exposed thousands of people to the disease after the student was not vaccinated and may have been infected during a recent trip out of the country.
Health Officials say someone who is not vaccinated can catch the virus hours after an infected person leaves the area and symptoms can appear seven to fourteen days after a person has been infected.
Signs of the disease include a cough, runny nose, and red, watery eyes then a rash and fever develop.