Public Health officials Friday confirmed a case of measles in a Los Angeles County resident who recently traveled internationally and visited at least three stores in the Santa Clarita Valley, possibly exposing others.

County Department of Public Health officials warned that people may have been exposed at all three locations, with the risk higher for people who are not immunized against measles.

According to health officials, the patient visited three locations on May 28:

— Costco, 18659 Via Princessa, Santa Clarita, from 10 a.m. to noon;

— Trader Joes, 19037 Golden Valley Road, Santa Clarita, from 2:30 to 4 p.m.; and

— Walmart, 25450, The Old Road, Stevenson Ranch, from 3:15 to 4:45 p.m.

Health officials warned that people who were at those locations could be at risk of developing

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