You probably remember measles as a childhood illness that had mostly disappeared from daily life. For years, cases in the United States were rare. This year, the picture looks very different.
The Centers for Disease Control and Prevention has confirmed 4,080 measles cases across 47 jurisdictions as of October 8, 2026. Around 95 percent of patients were either unvaccinated or had an unknown vaccination history.
That makes 2026 the worst US measles year since 1991, when the country logged more than 9,000 cases. The United States officially eliminated the disease in 2000, and public health experts say that status is now at risk.
Pennsylvania remains the center of the outbreak
Pennsylvania alone accounts for 1,136 cases, more than a quarter of the national total. State health officials have logged 219 hospitalizations and five deaths tied to the Pennsylvania outbreak.
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Only four of Pennsylvania's cases involved people with a documented MMR vaccination. The CDC's national tally currently recognizes two of the state's deaths, with the remaining three under review.
New York declared a state disaster emergency
On Monday, October 6, 2026, Governor Kathy Hochul issued a statewide disaster emergency as cases spread through under-immunized rural communities. The order runs through November 4.
New York has recorded 108 cases this year, with 92 reported since July 15 across 18 counties. Seven of those cases were in New York City and 101 elsewhere in the state.
The declaration lets pharmacists give the measles, mumps and rubella (MMR) vaccine to children as young as two. Registered nurses can also order testing for suspected cases, and MMR shots must be reported to immunization registries within 72 hours.
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"No one should get seriously ill or die from a vaccine-preventable disease," Hochul said when announcing the measure, according to Insurance Journal.
What to check in your family's records
The CDC recommends two doses of the MMR vaccine for lasting protection. One dose is about 93 percent effective against measles, and two doses raise that to roughly 97 percent.
Vaccination coverage among US kindergartners has slipped. In the 2025 to 2026 school year, 92.4 percent of kindergartners had both MMR doses, down from 95.2 percent in 2019 to 2020.
If you are unsure of your own or a child's vaccination status, a family doctor or local pharmacy can review the records and give a catch-up dose where needed.
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This article is made and published by Aksel Kryhlmand, who may have used AI in the preparation.