US Measles Elimination Status Under Review Amid Rising Cases

The United States is facing scrutiny over its measles elimination status as outbreaks continue to occur, prompting a delay in a critical review by the World Health Organization (WHO) and its regional arm, the Pan American Health Organization (PAHO). The review, initially scheduled for April 2026, has been postponed to November to allow for a more comprehensive analysis of recent data.

Rising Cases and Declining Vaccination Rates

The US has experienced a surge in measles cases, with outbreaks concentrated in states like Texas and South Carolina. Recent outbreaks have exceeded 1,000 cases. This resurgence is linked to declining vaccination rates, with 13 states reporting vaccination coverage below 90% in the last school year. Only ten states currently meet the WHO’s recommended herd immunity threshold of 95% .

Review Delay and Concerns Over Political Influence

The postponement of the review sparked initial concerns about potential political motives, particularly as it came after the US midterm elections. However, both the WHO and PAHO have emphasized that the delay is solely due to technical reasons – the need for a thorough and exhaustive epidemiological review. Kate O’Brien, director of the Department of Immunization, Vaccines, and Biologicals at WHO, stressed the importance of having “all of the data, all of the evidence, all of the analysis…scrupulously done” .

What Losing Elimination Status Means

The US achieved measles elimination status in 2000, a significant victory after a period where the disease infected nearly every child and caused approximately 500 deaths annually before widespread vaccination. Losing this status would be a setback for public health, signaling a failure to maintain sufficient vaccination coverage to prevent sustained transmission. Several other countries, including the UK, Spain, Armenia, Azerbaijan, and Uzbekistan, have recently lost their measles elimination status .

Global Impact of Measles

Measles remains a significant global health threat, particularly in low- and middle-income countries. An estimated 95,000 measles deaths occur each year, primarily among unvaccinated or under-vaccinated children under the age of five . Yemen, Indonesia, India, Pakistan, and Angola accounted for the majority of the disease burden in 2025 . The measles vaccine is highly effective and has averted nearly 59 million deaths between 2000 and 2024 .

Measles: Symptoms and Prevention

Measles is a highly contagious airborne disease that spreads through respiratory droplets. Symptoms include a high fever, cough, runny nose, and a characteristic rash all over the body . Vaccination remains the most effective way to prevent measles and protect both individuals and communities.