United States loses measles-free status after record surge in 2026 cases

The United States has lost its measles-free status following a record surge in infections recorded throughout 2026. The Pan-American Health Organization announced on Saturday, November 14, 2026, that the country no longer maintains its status as a measles-free nation. This announcement follows a significant rise in the number of confirmed infections across the country.

Rising infection rates

The Centers for Disease Control and Prevention recorded 5,412 measles cases in the United States from the beginning of 2026 until the date of reporting. This 2026 case count represents more than double the 2,242 cases recorded in 2025. The 2025 total had previously been noted as the highest level of infections in three decades. Data indicates that approximately one-third of the 2026 cases are linked to outbreaks that began in 2025 and remain active.

The loss of measles-free status occurs when population immunity decreases to a level that allows continuous spread. This typically happens when vaccination rates are insufficient to prevent the virus from moving through a community. The United States was previously declared to have eradicated measles in 2000 following an extensive vaccination campaign.

Hospitalizations and fatalities

The surge in infections has resulted in significant medical complications for many patients. Recent months have seen 590 hospitalizations and at least six deaths related to measles. On November 3, 2026, New York State recorded its first measles death in over 30 years. This fatality involved a child in Lewis County. Lewis County authorities expressed deep regret and condolences regarding the death of the child in Lewis County due to the measles outbreak.

Health experts have expressed concern regarding the potential for further spread. Physician Céline Gounder warned that the situation increases the risk of exposure and contraction for unvaccinated individuals.

Definition of measles-free status

The World Health Organization defines a country as measles-free if there are no local transmission infections or outbreaks lasting 12 months or longer. The current surge in cases has prevented the United States from meeting these specific criteria. The increase in cases from 2,242 in 2025 to 5,412 in 2026 marks a substantial reversal of the progress made since the eradication declaration in 2000.

Glossary

• measles-free status — A status defined by the World Health Organization for a country with no local transmission infections or outbreaks lasting 12 months or longer.