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U.S. Lost Measles Elimination Status After 5,400 Cases in 2026

The Pan American Health Organization has ruled that the United States no longer qualifies as having eliminated measles, a status held since 2000. Researchers say the decision follows more than 5,400 cases this year, more than double 2025's total. Here is what changes.

By Elena Vance

November 14, 20263 min read

U.S. Lost Measles Elimination Status After 5,400 Cases in 2026

The United States has lost its measles elimination status, researchers with knowledge of the decision confirmed on Saturday, November 14, 2026. The Pan American Health Organization (PAHO), the regional office of the World Health Organization for North and South America, made the call. It is the first time the country has failed the standard since 2000.

An independent commission of experts that reports to PAHO's director determined the U.S. no longer qualified, a source close to the process said. The decision was widely expected after years of falling vaccination rates and rising case counts. PAHO is set to hold a news conference on Tuesday.

The World Health Organization says a country has eliminated measles if there are no locally transmitted infections or outbreaks lasting 12 months or longer. The U.S. missed that mark.

The numbers behind the ruling

The Centers for Disease Control and Prevention (CDC) has tallied 5,412 measles cases so far in 2026. That is more than double last year's 2,242, which was itself a 30-year record. The CDC counts more than 590 hospitalizations and at least six measles-related deaths, and some states report additional fatalities.

Other reporting puts the toll higher. State reports show at least 10 people have died, and roughly 1 in 9 cases has led to hospitalization, according to the CDC.

Pennsylvania has the largest outbreak, with more than 1,500 cases and seven deaths this year. New York and Wisconsin have each reported one death. Cases have been confirmed in 45 states and Washington, D.C.

About a third of this year's cases trace to outbreaks that began in 2025 and are still spreading. In Utah, public health laboratory scientists published a preprint study in August showing one measles strain circulated in the state for more than a year. It accounted for more than 95% of cases there and caused more than 600 infections between June 2025 and June 2026.

What it means for the public

CBS News medical correspondent Dr. Céline Gounder said a country loses the status once immunity drops enough for the virus to keep spreading. Small outbreaks that once fizzled out can now become ongoing chains of transmission.

"It means that we're at risk of being exposed to measles and getting measles if we're not vaccinated," Gounder said. She added that emergency rooms and pediatricians now need to consider measles in anyone with a fever and rash, whether or not they have traveled overseas. The U.S. may also become an exporter of measles to other countries, she said.

Nearly all of this year's cases have been in people who were unvaccinated or whose vaccination status is unknown. Two doses of the measles-mumps-rubella (MMR) vaccine cut an exposed person's chance of illness by 97%.

Dr. Demetre Daskalakis, former director of the CDC's National Center for Immunization and Respiratory Diseases, called elimination "a vital sign for our public health system." He said, "It shows cracks in our foundation."

PAHO says the best way to keep measles eliminated is a vaccination rate of 95% or higher, backed by fast case detection, laboratory capacity and rapid outbreak response. Dr. Omer Awan, an epidemiologist, said regaining the status requires higher vaccination rates and a fight against misinformation. "It's frustrating and heartbreaking ... because we have the tools to fight this," Awan said.