According to officials in San Francisco, tens of thousands of people could have been exposed to measles by someone who rode the BART train six times over a three-day period last week. 

ABC 7 in San Francisco reports that the unidentified person, who reportedly works for LinkedIn, road the train during the morning and evening commutes on three consecutive days. Local health officials also provided a timeline for the person's journey:

The infected person boarded BART trains in Lafayette last week, three days in a row, during the morning and evening commutes. He or she exited at the Montgomery Street station in San Francisco and went to work at LinkedIn's offices on 2nd St.

Health officials have released the following timeline for the BART travel -- the individual was on BART between 6 a.m. and 8 a.m. from Feb. 4 through Feb. 6. and then returned from San Francisco to Lafayette each of those evenings from 7 p.m. to 9 p.m.

In addition, the individual is said to have gone to E&O Kitchen and Bar between 5:30 p.m. and 7:30 p.m. last Wednesday. 

Health officials told ABC 7 that the infected person is at home recovering, and will remain in isolation for 21 days. LinkedIn Director of Corporate Communications Hani Durzy released the following statement on the incident yesterday: 

On Tuesday, Feb. 10, we were informed that an employee based in our San Francisco office was diagnosed with measles. We are working very closely with the San Francisco Department of Public Health, and following their recommended protocol for managing this situation. The health and well-being of our employees is our absolute top priority, and we will take whatever steps are advised to ensure their safety and the safety of the general public.

[via ABC 7]