Large crowd at a music concert.
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A MASSIVE health alert has been issued after tens of thousands of people may have been exposed to measles at a packed concert.

Officials are now urging more than 55,000 attendees to monitor for symptoms and check their vaccination records.

Large crowd at a music concert.
A non-New Jersey resident attended the May 16 concert (stock image)Credit: Getty
Illustration of measles virus particles.
The new Jersey Department of Health confirmed the measles case (stock image)Credit: Getty
Shakira performing on stage.
A person with measles attended Shakira’s sold-out concert at the MetLife StadiumCredit: AP

An alert was activated following a case where a non-resident of New Jersey, who was present at the event on May 15 at MetLife Stadium, was confirmed to have contracted the highly infectious virus.

The individual was inside the venue between 7:30 pm and 1 am during the sold-out Shakira concert.

The New Jersey Department of Health confirmed the case and said it’s unclear where the infected person was seated.

Officials have cautioned that those who were present at the stadium from 7:30 pm on May 15 until 1:00 am on May 16 may have been exposed to the virus and could possibly develop symptoms by as late as June 6.

Symptoms of measles include high fever, dry cough, red and watery eyes, and a runny nose.

A rash usually follows within a few days and spreads from the face down to the rest of the body.

Measles can lead to serious complications such as pneumonia, brain swelling, and in rare cases, death.

It can also cause miscarriages or premature births if contracted during pregnancy.

As of May 20, no additional measles cases have been reported in New Jersey.

But the incident adds to growing concerns nationwide as measles continues to spread in the US.

Urgent measles warning to Ryanair passengers as cases spread

More than 1,000 cases have been confirmed across 31 states so far in 2025.

The majority of cases are in children, with 303 cases in children under 5, and 388 cases in children between 5 and 19.

Texas has seen the most cases, with over 700 confirmed and two child deaths this year.

Children under five account for a large portion of recent cases, and nearly a quarter of them required hospitalization.

What to know about measles

Measles is an extremely infectious viral ailment that transmits through coughing, sneezing, or direct interaction with someone infected. The virus has the capability to remain in the air for up to two hours.

Symptoms:

  • High fever
  • Dry cough
  • Runny nose
  • Red, watery eyes
  • Rash (usually starts on the face and spreads downward)

Symptoms usually appear 7 to 14 days after exposure. The rash typically shows up 3 to 5 days after early symptoms begin.

Complications:

Can include pneumonia, brain swelling (encephalitis), miscarriage, premature birth, and even death, especially in young children and pregnant women.

How it spreads:

Measles is one of the most contagious viruses on Earth. Up to 90% of unvaccinated people exposed to it will get sick. If one person has it, up to 9 out of 10 people nearby will become infected if they are not protected.

Cases in the US (2025):

  • 1,024 confirmed cases of measles across 14 outbreaks this year
  • Cases span 31 states
  • Texas has the highest number, with over 700 cases, including two child deaths
  • Nearly all infections involve unvaccinated individuals or people with unknown vaccination status

Confirmed measles cases were reported by 31 jurisdictions:

Alaska, Arkansas, California, Colorado, Florida, Georgia, Hawaii, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maryland, Michigan, Minnesota, Missouri, Montana, New Jersey, New Mexico, New York City, New York State, North Dakota, Ohio, Oklahoma, Pennsylvania, Rhode Island, Tennessee, Texas, Vermont, Virginia, and Washington.

Vaccine info:

The MMR (measles, mumps, rubella) vaccine is 97% effective after two doses.

Updated by CDC on May 16, 2025

Most of those infected were unvaccinated or unsure of their vaccination status.

Health experts say the measles, mumps, and rubella vaccine is 97% effective when both doses are given.

But vaccination rates have dropped in recent years, falling below the 95% threshold needed for herd immunity.

Only 11 states met that threshold among kindergartners in the last school year.

Federal health officials are warning that if the US sees continuous measles transmission for a year, the country could lose its elimination status.

Before the measles vaccine became available in 1963, the disease was so common that health experts believe nearly everyone was exposed to it, which led to some level of natural immunity in the population.

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