New Jersey health officials issued a warning about a potential measles exposure during the Shakira concert at MetLife Stadium.

According to the New Jersey Department of Health, concertgoers at a recent Shakira concert held in MetLife Stadium may have been exposed to measles. This comes after the recent discovery that a fan from outside the state attended the concert while infected with the disease on May 15.

A person who attended a Shakira concert at MetLife Stadium on May 15 was infected with measles and may have spread the highly contagious virus.