New Jersey health officials are warning people who attended Thursday's Shakira concert at MetLife stadium that a concertgoer had the measles​.

Shakira fans who attended the singer’s Thursday show at MetLife Stadium are being warned by health officials that at least one concertgoer had the measles.

However, measles still poses a serious threat. A highly contagious respiratory disease caused by a virus, measles spreads easily through coughing and sneezing. Even after an infected person has left the room, the virus can remain present in the air for up to two hours, according to the CDC.