A male student at University of California, Berkeley, was contagious with measles after traveling to Asia and might have spread it on a transportation system in Northern California between Feb. 4 and Feb. 7.
The student's identity has not been released to the public, but people who might have been in close contact with him are being contacted.
According to KTVU, Dr. Brad Buchman, director of University Health Services said, "We want to be on the lookout for any new individuals who may develop symptoms" and that 300 measles vaccines are going to the campus for people who want protection from the disease.
CNN writes, people who shared the airspace with the infected student 1 to 2 hours after he left and people who have not received the measles vaccinate are at a high risk, said Erika Jenssen, disease program director for Contra Costa Health Services on Thurs.
The student rode the BART, also known as Bay Area Rapid Transit.
Measles symptoms are initially similar to the common cold, but then a rash usually appears.
It takes between seven and 10 days to show symptoms.
image: Wikimedia Commons
