The student, who had recently gone abroad and avoided a measles vaccination, spent time in the Bay Area community for several days, health officials learned on Wednesday.
"Measles is a serious, highly contagious disease," Janet Berreman, health officer for the City of Berkeley, said. "It spreads through the air, when an infected person coughs or sneezes. Fortunately, the measles vaccine is highly effective in preventing infection."
The organization urges anyone showing symptoms to contact their health care provide immediately. While those vaccinated or who've previously had the illness remain unlikely candidates for infection, 90% of others close the source will become infected, according to the CDC.
Symptoms include: blotchy rash; fever; cough; runny nose; red, watery eyes; feeling run down and achey; tiny white spots with bluish center on the inside of the mouth, according to the CDC. The virus spreads through the air and can survive up to two hours on infected surfaces.
Contra Costa Health Services, the California Department of Public Health, UC Berkeley and City of Berkeley Public Health continue to investigate the student's movements and will notify anyone who came into close contact with him. But the agencies have yet to identify any other cases.
We'll update this post as we gather more information.