Contra Costa Co. — A man infected with measles who may have exposed BART riders to the virus is an employee at LinkedIn.

Company officials said they were informed Tuesday about the measles diagnosis and are working with the San Francisco Department of Public Health in managing the 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,” LinkedIn said in a statement.

BART riders are being advised that they may have been exposed to measles after the man rode BART to San Francisco for work.

Contra Costa Public Health officials have confirmed that this is the county’s first measles case since the statewide outbreak began in December and issued an advisory today after learning the person traveled on BART before being diagnosed.

Officials say most people are not at risk since they are vaccinated against measles, but anyone who is not vaccinated is at risk to be infected if exposed to the virus.

Officials say the infected person traveled between the Lafayette Station and Montgomery Station in San Francisco during the morning and evening commutes from 6 a.m. to 8 a.m. and 7 p.m. to 9 p.m. on Wednesday, Thursday and Friday, February 4-6.

The person also spent time at the E & O Kitchen and Bar located at 314 Sutter Street in San Francisco on Wednesday evening between 5:30 p.m. and 7 p.m., February 4th. E & O is fully cooperating with the San Francisco Department of Public Health.

Contra Costa Public Health and the San Francisco Department of Public Health are working together on investigating the person’s movements and notifying people who were in close contact.

Because the measles virus can stay in the air for up to two hours and BART cars circulate throughout the Bay Area, anyone who used the transit system during that time could have potentially exposed to the virus. Health officials urge anyone who shows symptoms of measles to contact their healthcare provider immediately.

Measles symptoms can begin one to three weeks after exposure and include high fever, runny nose, coughing and watery red eyes. A rash develops on the face and neck two to three days after the fever begins, and spreads down the body. The rash usually lasts five or six days. An infected person is contagious for several days before and after the rash appears.