Measles cases in the United States have surged past 5,400 this year, driven by falling vaccination coverage and culminating in the loss of the country’s 26-year-old measles-free status as additional deaths are reported in Pennsylvania and Wisconsin.
PAHO Revokes US Measles-Free Status
- What happened: The Pan American Health Organization revoked the United States measles-free status after uninterrupted transmission lasted more than 12 months.
- How it spreads: Measles is a highly contagious viral illness that passes easily through respiratory droplets, making community immunity vital.
- Prevention: The measles, mumps, and rubella vaccine offers approximately 97 percent protection after two doses, according to public health data.
Loss of Elimination Status After 26 Years
The Pan American Health Organization revoked the United States measles-elimination status after determining that the country experienced uninterrupted transmission of the virus for more than 12 months, Al Jazeera reported. The decision ends a designation the nation held since 2000, when widespread vaccination programs successfully interrupted endemic spread.
The international committee that determines elimination status considers an infection to be endemic when infections caused by the same strain pass from person to person for at least a year within the same country, CNN reported. An independent commission of experts reported the finding to the director of the Pan American Health Organization, after a process first reported by The Wall Street Journal.
The country is battling the highest number of measles cases it has seen in more than 30 years, according to Al Jazeera. About 7,500 people in the US have been infected and 13 have died since last year, a period coinciding with the tenure of US Health Secretary Robert F Kennedy Jr, who has for years questioned vaccine safety without scientific evidence.
Measles Deaths Rise in Pennsylvania and Wisconsin
Pennsylvania and Wisconsin announced one additional measles-associated death each, bringing the total number of US deaths linked to the disease this year to 10. The Wisconsin Department of Health Services reported an infant’s death, while the Pennsylvania Department of Health recorded the death of an unvaccinated patient who tested positive for the virus.
Pennsylvania has logged seven measles-associated deaths, while Wisconsin has reported two. On November 2, New York reported a child’s death in the state’s first recorded measles fatality in more than 30 years, according to Al Jazeera.
The Centers for Disease Control and Prevention and the Johns Hopkins University International Vaccine Access Center tracker recorded more than 5,400 confirmed measles cases in the US to date. That figure is more than double the 2,289 confirmed cases reported in 2025.
| Metric | 2025 Data | 2026 Data |
|---|---|---|
| Confirmed Cases | 2,289 | 5,400+ |
| CDC Recorded Deaths | 6 | Double 2025 figures |
Disputes Over National Death Tracking
A dispute has emerged between state officials and federal health agencies over how to classify and count measles fatalities, Al Jazeera reported. The CDC’s national death toll is lower than the aggregate count reported by state health departments.
Kennedy asked CDC director Erica Schwartz not to count the deaths in the official tally, claiming a lack of evidence linking them directly to measles, according to Al Jazeera. Pennsylvania Governor Josh Shapiro and federal officials have disagreed over the classification criteria.
Pennsylvania defines measles-associated deaths as occurring when a person with confirmed measles dies within 30 days of developing symptoms, unless an unrelated event caused the death. Epidemiologists told Al Jazeera that tracking measles-associated deaths remains a standard methodology used by the World Health Organization and the CDC.
Vaccination Coverage Gaps and Resurgence
According to Al Jazeera, the rate of vaccination among kindergarteners in the US fell from 95.2 percent in the 2019-2020 school year to 92.4 percent by the 2025-2026 school year. Local and state health departments have ramped up vaccination efforts to counter the decline.
“It appears highly likely that the USA will lose its measles elimination status in 2026,” Anne Bischops of Boston Children’s Hospital and Harvard Medical School wrote in an analysis published in The Lancet in April, as noted by Tech Times.
Data shows that the proportion of US measles infections tied to travel from abroad dropped from approximately 40 percent throughout the 2001-2011 elimination phase to 10 percent in 2025 and 6 percent during the beginning of 2026.
“Losing elimination status means that we are less prepared as a nation to address infectious and noninfectious disease challenges,” said the former head of the US Centers for Disease Control and Prevention’s National Center for Immunization and Respiratory Diseases, Demetre Daskalakis.
Contraindications & When to Consult a Doctor
The measles, mumps, and rubella vaccine is a live-attenuated viral immunization. It is contraindicated for individuals with severe immunodeficiency conditions, pregnant individuals, and those with a history of a severe, life-threatening allergic reaction to a previous dose or vaccine component such as gelatin or neomycin.
Patients experiencing symptoms such as a high fever, cough, runny nose, red watery eyes, followed by a characteristic maculopapular rash spreading from the face downward, should contact a healthcare provider immediately. Medical consultation is especially critical for infants, pregnant women, and immunocompromised individuals who have had known exposure to the virus.
Path Back to Elimination Status
Under the regional framework established by the Pan American Health Organization and the World Health Organization, a country that loses its elimination status must demonstrate at least 12 consecutive months of interrupted endemic transmission and submit a corrective action plan addressing structural causes of the outbreak, Tech Times reported.
Canada lost its elimination status in November 2025 and remains classified as endemic for measles more than a year later, having failed to regain the designation. Canada’s epidemic was declared over in October 2026, according to reports, while the U.S. epidemic continues to experience an acceleration.
The path back requires sustained vaccination coverage above 95 percent at both national and subnational levels, a threshold the United States has not met consistently since 2020, according to Tech Times.
References
- The Centers for Disease Control and Prevention (CDC) tracks measles data.
- Pan American Health Organization (PAHO).
- The Lancet.
- KFF.
