An independent commission of experts reporting to the Pan American Health Organization (PAHO) determines whether a country has failed to halt continuous transmission of the virus for at least 12 months, ending a period of success in controlling the highly contagious disease.
The revocation of this status follows a surge of measles cases that has reached levels not seen in the United States in over three decades. According to the Centers for Disease Control and Prevention (CDC), there have been more than 5,400 confirmed measles cases reported nationwide in 2026 as of mid-November. By comparison, there were 2,289 cases in 2025, 285 cases in 2024, and only 85 cases in the year the U.S. first achieved elimination status.
Robert F. Kennedy Jr. in a 2021 book wrote that Americans had been "misled … into believing that measles is a deadly disease." He said measles outbreaks had been "fabricated" to push people towards vaccines. https://t.co/lBXK42mpjj pic.twitter.com/lo7ZA0nv8F
The demographics of the current outbreak have changed. According to data from Contagion Live, adults aged 20 and older now make up 41 percent of 2026 cases. This is a group for which researchers have historically had little information.
Gavin Harris, an infectious diseases physician with Emory Healthcare in Georgia, said that adults are becoming infected at rates equal to or higher than children. In some instances, the virus has even led to congenital measles, where mothers pass the infection to their babies in the womb.
Dr. Paul Offit, director of the Vaccine Education Center at the Children’s Hospital of Philadelphia, described the situation as “a tremendous step backwards.” Public health experts, including Jennifer Nuzzo of the Brown University School of Public Health, have said that losing elimination status is a point of embarrassment for the country. The loss of status suggests a decline in the nation’s ability to protect its population from infectious diseases.
Outbreaks Cause Nearly $83 Million in Economic Impact
The ongoing outbreak has become a significant financial burden. Researchers at Johns Hopkins University created a model that calculates the outbreaks have resulted in an economic impact of nearly $83 million. Such expenses are largely driven by the labor-intensive nature of contact tracing and outbreak investigation.
At the pediatric clinic of Dr. Gary M. Kramer in Coral Gables, Florida, a medical assistant administers a measles, mumps and rubella vaccine to a young patient in Aug.
Adults and Congenital Measles Change Outbreak Demographics
The demographics of the current outbreak have changed. According to data from Contagion Live, adults aged 20 and older now make up 41 percent of 2026 cases. This is a group for which researchers have little information. Mothers have even given birth to babies with measles. “Now, you’re seeing something we just didn’t see at all – congenital measles,” Offit said.
The health consequences for those infected can be severe. Measles is known as one of the most contagious illnesses known to mankind, capable of causing pneumonia, brain swelling known as encephalitis, and death.
According to the U.S. Centers for Disease Control and Prevention, these serious complications can cause pneumonia, encephalitis or death in 1 to 3 of every 1,000 children infected. As of November 2026, there have been 10 measles-associated deaths reported in the U.S. this year.
Declining MMR Immunization Rates Threaten Children
The decline in measles, mumps, and rubella vaccination rates is central to the loss of elimination status. Since the 2019-2020 school year, MMR immunization among kindergarteners has dropped from 95.2% to 92.4% in 2025-2026, which puts roughly 280,000 children in that age group in danger.
Dr. Paul Offit, director of the Vaccine Education Center, described the situation as “a tremendous step backwards.” Losing elimination status indicates the country is less healthy than it was 26 years ago, when it achieved elimination.
Despite the official designation change, federal officials maintain that their response strategy remains unchanged. CDC Director Erica Schwartz stated this week that the agency will continue working with state and local health departments to reach those communities. “The measles elimination designation is not what protects Americans. Vaccination does,” she said.
Regaining Elimination Status Requires Halting Virus Spread
Regaining elimination status will be a complex process. To be re-certified as having eliminated measles, a nation must halt the spread of the virus and maintain a period of 12 months without any outbreaks.
Public health experts warn that until vaccination rates improve and transmission is contained, the risk of outbreaks will persist. For individuals with questions regarding their own vaccination history, Picking said, “Talk to your provider, talk to your pharmacist if you have any questions or concerns about your vaccination history.”
Earlier coverage: PAHO Commission Revokes US Measles Elimination Status