U.S. has already posted more measles cases than in any year since 1991 and 2025 is only half over

The U.S. is having its worst year for measles spread in more than three decades, and the year is only half over.

The national case count reached 1,288 on Wednesday, according to the U.S. Centers for Disease Control and Prevention, though public health experts say the true figure may be higher.

The CDC’s count is 14 more than 2019, when America almost lost its status of having eliminated the vaccine-preventable illness — something that could happen this year if the virus spreads without stopping for 12 months. But the U.S. is far from 1991, when there were 9,643 confirmed cases.

In a short statement, the federal government said that the CDC “continues to recommend (measles, mumps and rubella) vaccines as the best way to protect against measles.” It also said it is “supporting community efforts” to tamp down ongoing outbreaks as requested.

Fourteen states have active outbreaks; four other states’ outbreaks have ended. The largest outbreak started five months ago in undervaccinated communities in West Texas. Three people have died — two children in Texas and an adult in New Mexico — and dozens of people have been hospitalized across the U.S.

But there are signs that transmission is slowing, especially in Texas. Lubbock County’s hospitals treated most of the sickest patients in the region, but the county hasn’t seen a new case in 50 days, public health director Katherine Wells said.

“What concerned me early on in this outbreak was is it spreading to other parts of the United States, and that’s definitely what’s happening now,” she said.

In 2000, the World Health Organization and CDC said measles had been eliminated from the U.S. The closer a disease gets to eradication, the harder it can seem to stamp it out, said Dr. Jonathan Temte, a family physician in Wisconsin who helped certify that distinction 25 years ago.

It’s hard to see measles cases break records despite the widespread availability of a vaccine, he added. The measles, mumps and rubella vaccine is safe and is 97% effective at preventing measles after two doses.

“When we have tools that can be really helpful and see that they’re discarded for no good reason, it’s met with a little bit of melancholy on our part,” Temte said of public health officials and primary care providers.

Wells said she is concerned about continuing vaccine hesitancy. A recent study found childhood vaccination rates against measles fell after the COVID-19 pandemic in nearly 80% of the more than 2,000 U.S. counties with available data, including in states that are battling outbreaks this year. And CDC data showed that only 92.7% of kindergarteners in the U.S. had the measles, mumps and rubella vaccine in the 2023-2024 school year, below the 95% needed to prevent outbreaks.

State and federal leaders have for years kept funding stagnant for local public health departments’ vaccination programs that are tasked with reversing the trend. Wells said she talks with local public health leaders nationwide about how to prepare for an outbreak, but also says the system needs more investment.

“What we’re seeing with measles is a little bit of a ‘canary in a coal mine,’” said Lauren Gardner, leader of Johns Hopkins University’s independent measles and COVID-19 tracking databases. “It’s indicative of a problem that we know exists with vaccination attitudes in this county and just, I think, likely to get worse.”

Currently, North America has three other major measles outbreaks: 2,966 cases in Chihuahua state, Mexico, 2,223 cases in Ontario, Canada and 1,246 in Alberta, Canada. The Ontario, Chihuahua and Texas outbreaks stem from large Mennonite communities in the regions. Mennonite churches do not formally discourage vaccination, though more conservative Mennonite communities historically have low vaccination rates and a distrust of government.

In 2019, the CDC identified 22 outbreaks with the largest in two separate clusters in New York — 412 in New York state and 702 in New York City. These were linked because measles was spreading through close-knit Orthodox Jewish communities, the CDC said.

This story was originally featured on Fortune.com