US Set to Lose Measles Elimination Status After 25 Years as PAHO Review Nears

Print Date: Nov 7, 2026 || Published Date: Nov 7, 2026

US Set to Lose Measles Elimination Status After 25 Years as PAHO Review Nears

The United States is on the verge of losing a public-health milestone it has held for a quarter of a century. When the Pan American Health Organization's Regional Verification Commission meets in Washington next week, it is widely expected to rule that measles is once again spreading endemically in the US, ending the elimination status held since 2000. The numbers already show why: 5,182 confirmed cases this year, eight deaths, and a single viral strain that has circulated without interruption for more than a year.

Key Points

The Pan American Health Organization's Regional Verification Commission meets November 10-13, 2026 in Washington for its sixth annual measles and rubella elimination review.
The US is widely expected to lose its measles elimination status, held since 2000, after one strain circulated with uninterrupted local transmission for 12 months or more.
The CDC reported 5,182 confirmed cases in 2026 as of November 5, with 330 new infections in the latest week. Only five states have reported no cases all year.
Eight measles-associated deaths have been reported this year, the highest toll since 1991, although the CDC has so far confirmed four.
Kindergarten MMR coverage has dropped to 92.4 percent, below the 95 percent herd-immunity threshold, and about 96 percent of cases are in people unvaccinated or with unknown vaccination status.

What Happened

The commission meets from November 10 to 13 in Washington to settle the question. A country loses its elimination status when data show a single strain circulating with uninterrupted endemic local transmission for 12 months or more. Whole-genome sequencing has traced a distinctive strain, D8-9171, from the Texas outbreak that began in January 2025 through Utah and into at least four other states.

The CDC reported 5,182 confirmed cases in 2026 as of November 5, with 330 new infections in the latest week alone. Only five states, Arkansas, Hawaii, Mississippi, Nevada and New Hampshire, have reported no cases this year. About 11 percent of cases have been hospitalised, including 17 percent of children under five.

Background: How the US Reached This Point

Measles was declared eliminated in the United States in 2000, meaning the virus no longer spread continuously within the country. Elimination never meant zero cases: imported cases arrived regularly but were contained before they could seed lasting chains of transmission. What changed is coverage. Kindergarten MMR vaccination fell from 95.2 percent in the 2019-20 school year to 92.4 percent in 2025-26, below the roughly 95 percent threshold needed to stop the virus spreading in a community.

The 2026 surge has been driven by large state outbreaks: Pennsylvania has reported 1,467 cases and six deaths, Kentucky 204 cases in its largest surge since 1991, and Wisconsin 431 cases, including an infant death, the state's first in more than 35 years. A child in Lewis County, New York, died in the state's first measles death in 30 years. The eight deaths reported this year are the highest annual toll since 1991.

Measles Elimination Status: What Losing It Means

Losing elimination status carries no sanctions, fines or formal penalties. It is official acknowledgement that measles is circulating endemically in the United States again after 25 years. Regaining it would require proving transmission has been interrupted for a full year, a clock that cannot start until the current chains of spread are broken.

There is a recent precedent close to home. Canada lost its own measles elimination status last November after a similar outbreak ran for 12 months. The Canadian experience showed how quickly a status built over decades can be undone by a single sustained outbreak.

Reactions and Official Guidance

The CDC continues to urge anyone unsure of their vaccination status to check their records and get vaccinated, and it advises parents to make sure children receive both MMR doses on schedule. The agency has repeatedly said vaccination is the most effective protection against measles. Two doses of MMR are about 97 percent effective, according to the CDC.

State health departments in the hardest-hit states have run vaccination drives, opened pop-up clinics and alerted doctors to watch for symptoms: high fever, cough, runny nose, red eyes and a rash that usually starts on the face. Officials have also noted the gap in death counts: states have reported eight measles-associated deaths this year, while the CDC, applying its own confirmation criteria, has confirmed four so far.

Why It Matters

Measles is one of the most contagious diseases known to medicine: an infected person can spread it by breathing or coughing, and the virus can linger in the air for up to two hours. Around nine in ten unvaccinated people exposed to measles will catch it, so even a small dip in coverage can produce a large outbreak.

The human cost is already visible: 5,182 cases, 562 hospitalisations and eight deaths, including an infant and a child, from a disease preventable with a vaccine costing a few dollars a dose. The hospitalisation rate among children under five, at 17 percent, is higher still.

What Happens Next

All eyes are now on the commission's meeting in Washington from November 10 to 13. If it rules as expected, the United States will join Canada on the list of countries in the Americas that have lost measles elimination status, and the year-long clock to regain it will not start until transmission is stopped. The CDC publishes its next weekly update on Friday; if the weekly increase stays above 300, the national total will pass 5,500 within two weeks.

For families, the advice is unchanged and simple: two doses of MMR, on schedule, for every child, and a catch-up dose for any adult who never received one.

Frequently Asked Questions

What is measles elimination status?
It means measles is no longer spreading continuously within a country. The US was declared to have eliminated measles in 2000, though imported cases were still contained before they could start lasting chains of transmission.

Why is the US about to lose it?
A single strain, D8-9171, has circulated with uninterrupted local transmission for 12 months or more, traced from the Texas outbreak of January 2025 through Utah and into at least four other states.

How many measles cases are there in the US in 2026?
The CDC reported 5,182 confirmed cases as of November 5, 2026, up 330 in the latest week, with only five states reporting no cases. Eight measles-associated deaths have been reported, the highest toll since 1991.

Does losing the status bring sanctions?
No. There are no fines or penalties. It is an official acknowledgement that measles is circulating endemically again, and regaining the status requires proving transmission has been interrupted for a full year.

How effective is the MMR vaccine?
Two doses of MMR are about 97 percent effective at preventing measles, according to the CDC. A first dose is recommended at 12 to 15 months and a second at 4 to 6 years.