CDC warns U.S. risks losing measles elimination status amid 1,300 cases

The U.S. Centers for Disease Control and Prevention said on Monday that the country could lose its World Health Organization‑certified measles elimination status as early as next year if the recent surge in cases continues. The warning follows more than 1,300 confirmed measles infections reported in 2024, the highest annual total since the disease was declared eliminated in 2000, and comes as health officials track outbreaks in at least 15 states.

Measles was declared eliminated in the United States after a sustained period of zero endemic transmission, meaning the virus was no longer spreading locally without being imported. The status depends on maintaining fewer than 12 cases per year for two consecutive years, according to WHO guidelines. The current threat stems from a combination of factors: declining vaccination rates in certain communities, the spread of misinformation about vaccine safety, and increased travel from regions where measles remains common. In the past decade, the national average for the two‑dose MMR (measles, mumps, rubella) vaccine has slipped from 93 % to about 89 %, with pockets of coverage below 80 % in parts of New York, Pennsylvania and the Pacific Northwest.

Health officials say the outbreaks have been fueled by unvaccinated children and adults who travel abroad and bring the virus back. In New York City, a single school cluster accounted for more than 200 cases, prompting a citywide emergency order that temporarily barred unvaccinated children from public schools. The CDC has launched a nationwide outreach campaign, offering free vaccination clinics and partnering with community leaders to counter misinformation. Experts warn that each new case raises the risk of complications, including pneumonia and encephalitis, and that the economic cost of outbreak response can run into millions of dollars.

If the U.S. loses its elimination status, the WHO could require the country to report measles cases more frequently and to implement stricter control measures. Public health leaders say the window to act is narrow: boosting vaccination coverage, especially in high‑risk areas, and improving surveillance are essential steps. The situation underscores how quickly a disease once thought controlled can resurface when immunity gaps widen.