Measles Outbreak

• As of June 18, 2026, a measles outbreak in the U.S. has reached 2,104 confirmed cases across 41 different jurisdictions. • The CDC has issued a warning that increased summer travel may accelerate the spread of the virus, posing a significant risk to families. • This surge highlights a critical public health challenge as officials urge vaccination and awareness to contain the outbreak.

Outbreak driven by falling vaccination and misinformation as federal public health cuts hamper state responseThe US has recorded more than 2,000 confirmed measles cases so far this year – near the total of 2,228 recorded in all of 2025, and on track to become the worst year for measles in decades as states struggle with the loss of federal funding for public health.The virus continues to spread in unvaccinated and under-vaccinated communities, including among babies too young to be vaccinated, and it reveals the depths of the twin crises of misinformation and public health in the US. Continue reading...

• The CDC confirmed 51 additional measles cases, bringing the nationwide U.S. outbreak to 1,893 infections as of May 16, 2026. • The agency said all but nine cases were locally acquired, 27 outbreaks have been reported this year, and 92% of patients were unvaccinated or had unknown vaccination status. • The outbreak is significant because measles spreads quickly in under-vaccinated communities, and the U.S. is now on pace to exceed last year’s 2,288 cases if transmission continues.

• A growing measles outbreak in South Carolina, reported in recent days, has seen case numbers rise amid low vaccination rates in certain communities. • Public health officials note multiple exposures and urge unvaccinated individuals to seek MMR shots immediately. • The outbreak underscores U.S. vulnerabilities with national MMR coverage at 92.7%, below herd immunity thresholds, risking wider spread.

• As of April 30, 2026, the US reported 1,814 confirmed measles cases, including 12 among international visitors, per CDC data updated May 1. • 93% of cases (1,688) are outbreak-associated, with 25 new outbreaks in 2026 following 24 earlier ones. • This surge underscores ongoing vaccination gaps, contributing to public health challenges amid 2,288 cases in 2025.

• South Carolina health officials ended the nation's largest measles outbreak after six months, with 997 infections and 21 hospitalizations but no deaths. • The outbreak concluded Sunday following over a month without new cases. • This marks a significant public health milestone amid rising national vaccination concerns.

• The largest measles outbreak in the United States in more than 35 years has ended, with no new cases reported in more than 42 days, according to the South Carolina Department of Public Health. • The outbreak began in October 2025 in South Carolina and resulted in nearly 1,000 confirmed cases over six months, with more than 600 cases occurring in 2026 alone; at least 21 hospitalizations were recorded with no reported deaths. • Canada has been significantly impacted, losing its measles elimination status on November 10, 2025, and reporting 907 cases since the start of 2026, with Manitoba accounting for 556 cases.