Measles is highly contagious. Here’s how to protect yourself

New Jersey health officials are asking people who went to last week’s Shakira concert at MetLife Stadium to monitor for measles symptoms because a person went to see the singer while infectious.

There is no confirmed outbreak in New Jersey, but the U.S. and North America are seeing high measles activity this year — including hundreds sickened by the highly infectious airborne virus in West Texas — and declining rates of people getting the vaccine, which is 97% effective after two doses.