Some Contra Costa residents and visitors may have been exposed to measles recently after a Contra Costa County resident visited several public venues while contagious. Contra Costa Public Health officials confirmed the case of measles and issued an advisory to Contra Costa health care providers after learning the person visited several popular indoor venues in Contra Costa, Los Angeles County, and Arizona during the infectious period. People in Contra Costa who were known to be in close contact with the case have been notified, but not every potential contact at a public venue can be identified. If your patient presents with measles symptoms, ask if they have visited the following locations at the indicated dates and times: (1) Aug. 11 from 11 am to 2 pm at John Muir Medical Center, Walnut Creek Emergency Department, and (2) Aug. 14 from 9 to 11 am at Chow Restaurant, 53 Lafayette Circle, Lafayette. To read the public health advisory, go to https://cchealth.org/press-releases/2018/0822-Measles-Case.php .