Measles, back in America.
For a generation, measles was a disease the United States had beaten. The country declared it eliminated in 2000 — no continuous, home-grown transmission. Twenty-five years later it is spreading again. In 2025 the U.S. logged 2,289 confirmed cases, the most in any year since 1992, and its first measles deaths in a decade. The virus did not change. Our defenses did: childhood vaccination has slipped below the level needed to keep measles from catching.
highest since 1992
first in a decade
reported in 2025
2024–25 · below target
stop transmission
A quarter-century of near-zero — then a wall.
After elimination, the U.S. averaged roughly 180 cases a year, almost all imported by unvaccinated travelers and quickly contained. Import sparks that once fizzled now find kindling: pockets of under-vaccinated communities where one case becomes hundreds. The 2014 and 2019 spikes were warnings. 2025 broke the scale.
One county lit the match.
The 2025 resurgence had an epicenter: Gaines County, Texas, an under-vaccinated rural community where the outbreak began in late January and grew to hundreds of cases — the large majority of the year's national total. From there it jumped to New Mexico, Kansas, Oklahoma and Ohio, and single cases surfaced in more than 30 states as travelers carried it across the country.
Nearly every 2025 cluster traced back to the same root: communities where MMR coverage had fallen below the 95% herd-immunity threshold. Where vaccination held, imported cases stopped at one or two.
Tile-grid map — each square is one state, positioned geographically, shaded by reporting tier during the 2025 outbreak period (not exact case counts). Reporting evolved through the year; consult CDC / state health departments for current figures.
This is a vaccination story.
Measles is among the most contagious diseases known — one case can infect up to 18 others. That is why the bar for community protection is so high: about 95% of people must be immune to stop it spreading. Two MMR doses are ~97% effective. But kindergarten MMR coverage has fallen every year since the pandemic, dipping to 92.5% in 2024–25, while vaccine exemptions hit a record high. The gap between 95% and where we are is exactly the room measles needs.
Of every 100 measles cases in 2025, roughly 93 were people who were not vaccinated — or didn't know if they were. Measles isn't back because it got stronger. It's back because immunity got thinner.
From a single county to a national alarm.
The record.
Figures are drawn from CDC, state health departments and WHO reporting for 2000–2025 and reflect the sources above as compiled in 2026. Annual and per-state counts are provisional and revised over time; the tile map uses reporting tiers rather than exact counts. For live, authoritative numbers, always refer to the CDC measles page. This page is an independent public-health visualization, not medical advice.