CDC warns – The CDC reports 2,030 confirmed measles cases across 38 states and Washington, DC, through June 4—already on pace to exceed the 2025 U.S. 30-year high. With 92% of cases in unvaccinated people and travel season approaching, officials warn the summer could acce
For the third morning in a row, measles is still spreading—only now the numbers are climbing faster than they did during the year that set a grim benchmark.
Six months into 2026, the U.S. is already seeing a scale of measles transmission that could top the highest total in 30 years. The CDC said that as of June 4. approximately 2. 030 confirmed measles cases linked to 30 separate outbreaks have reached 38 states and Washington. DC since the beginning of 2026. resulting in at least 127 hospitalizations.
The agency said the pace is especially stark because the clock is still early: as of April, the CDC reported 1,792 confirmed cases, and warned additional cases are expected as summer travel season approaches.
CDC data also points to who is most exposed. The CDC said 92% of cases occurred in unvaccinated people, and 72% occurred in children aged 19 and younger. Ten of the cases as of June 4 were from international travelers, while the remaining 2,020 occurred across 38 states plus Washington, DC.
With half a year left, 2026 is on track to blow past 2025’s record. In 2025, the previous 30-year high came with 2,242 confirmed measles infections across 45 jurisdictions for the full year. Nearly 90% of cases were directly linked to 45 known outbreaks. and 93% of infections were contracted by unvaccinated people or those with unknown vaccination status. Three people. including two children. died as a result of the outbreaks—marking the first pediatric death from measles in a decade.
The difference between “spreading” and “out of control” is often measured in hospital beds and missed opportunities to prevent exposure. Here, the CDC’s figures show both: at least 127 hospitalizations tied to outbreaks already documented in 2026.
A map of the 2026 spread shows confirmed cases across a wide geography. including Alaska. Arizona. California. Colorado. Florida. Georgia. Idaho. Illinois. Kansas. Kentucky. Louisiana. Maine. Maryland. Massachusetts. Michigan. Minnesota. Missouri. Montana. Nebraska. New Jersey. New Mexico. New York. North Carolina. North Dakota. Ohio. Oklahoma. Oregon. Pennsylvania. Rhode Island. South Carolina. South Dakota. Texas. Utah. Vermont. Virginia. Washington. Wisconsin. and Wyoming. plus Washington. DC.
Measles itself is not subtle. It is a highly contagious, vaccine-preventable disease caused by a virus that primarily and most severely afflicts children. The World Health Organization says it infects the respiratory tract before spreading throughout the body. and it is characterized by high fever. cough. runny nose. watery eyes. and rashes or bumps that appear seven to 14 days after exposure.
The contagiousness is a major reason outbreaks can surge once they find vulnerable pockets. The CDC says 90% of unvaccinated people who are exposed end up contracting measles. It also says 1 in 5 of those people end up hospitalized.
Protection exists, and the standard tool remains the MMR vaccine (measles, mumps and rubella). The CDC says it protects against measles with 97% efficacy. The vaccine is typically administered to children at ages 12 to 15 months for the first dose and ages 4 to 6 for the second.
The question now is why those defenses are weakening just as transmission is accelerating.
In recent years, MMR vaccination uptake has declined. The CDC said that has resulted in a growing number of states no longer reporting rates consistent with herd immunity. The basic math is straightforward: when more than 95% of people in a community are vaccinated. most people are protected—even those who cannot get the vaccine themselves—because those around them are immune and cannot spread the disease.
The CDC said vaccination coverage among U.S. kindergartners dropped from 95.2% during the 2019–2020 school year to 92.5% in the 2024–2025 school year, well under the threshold needed for herd immunity.
Outbreaks tend to follow the fault lines. The source describes that outbreaks—such as the large one focused in Texas in 2025—often occur within communities with large pockets of unvaccinated people. It also points to a small, under-vaccinated Mennonite community that was at the center of last year’s largest outbreak.
The declining protections have also been linked to the expanding anti-vaccine movement. which was bolstered by the confirmation of vaccine skeptic Robert F. Kennedy Jr. as health secretary. The source says Kennedy has made anti-vaccine comments. downplayed pediatric deaths related to measles. and touted false cures and preventives such as the use of vitamin A.
During the height of the 2025 outbreak, the source says Kennedy somewhat pulled back from anti-vaccine messaging and encouraged inoculation against measles.
The risk is not just more cases—it is the possibility of losing measles elimination status. The source says measles elimination is defined by the World Health Organization as freedom from the continuous spread of a disease for at least a year. and it has been called a “historic public health achievement” by the CDC.
That status is now facing scrutiny beyond U.S. borders. The Pan American Health Organization. part of the World Health Organization that tracks infectious diseases in the Americas. is set to review the U.S. and Mexico’s measles elimination status in November. The review was pushed from the originally planned April date, and the source says the U.S. review stems from the 2025 outbreaks.
The stakes are underscored by what has already happened in the region. PAHO already removed Canada’s elimination status in November after three decades.
For readers watching headlines from outbreak maps and hospital counts, the message is stark: the U.S. is moving toward another grim milestone before summer is even fully underway—backed by CDC totals already reaching into multiple outbreaks and overwhelmingly tied to unvaccinated people.
measles cases 2026 CDC MMR vaccine vaccination coverage herd immunity outbreak map hospitalizations 2025 record Robert F. Kennedy Jr. PAHO measles elimination status