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BART riders may have been exposed to measles by a University of California at Berkeley student who traveled on trains in Contra Costa and Alameda counties last week while infected with the disease, officials said Thursday.

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CalMatters is a Sacramento-based nonpartisan, nonprofit journalism venture committed to explaining how California's state Capitol works and why it matters. It works with more than 130 media partners throughout the state that have long, deep relationships with their local audiences, including Embarcadero Media.