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BART riders commuting to San Francisco may have been exposed to measles, public health officials are warning after a passenger tested positive for the infectious virus.

The infected rider worked in LinkedIn’s San Francisco office and traveled between there and Lafayette during the morning and evening commutes from Feb. 4 to 6, according to the Contra Costa County Public Health Department and a company official.

LinkedIn released a statement after it learned the traveler was a company employee.

“We are working very closely with the San Francisco Department of Public Health, and following their recommended protocol for managing this situation,” a LinkedIn spokeswoman said.

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