U.S. Measles Resurgence Threatens Elimination Status as Outbreaks Spread

The United States is confronting a renewed surge of measles cases that public health officials warn could put the country’s long-standing elimination status at risk. After more than two decades in which measles transmission was largely contained through widespread vaccination, outbreaks in multiple states, most notably South Carolina, have exposed growing vulnerabilities tied to declining immunization rates and rising vaccine hesitancy.

South Carolina at the center of Measles Surge in the US

South Carolina is experiencing the most significant measles outbreak in the country. Since late 2025, state health officials have reported hundreds of confirmed cases, concentrated in the Upstate region around Greenville and Spartanburg, with spread into schools, churches, colleges, and other community settings. A number of patients have required hospitalization, the majority of them unvaccinated.

State epidemiologist Dr. Linda Bell has warned that the outbreak could continue for weeks or months unless vaccination rates rise substantially. Health officials say the virus has spread rapidly in communities where routine childhood immunization coverage has fallen well below recommended levels.

A growing national concern

The outbreak in South Carolina is not isolated. Measles cases have also been confirmed in North Carolina, Georgia, Florida, Ohio, Arizona, Utah, Oregon, and Virginia. In 2025, the United States recorded more than 2,200 confirmed measles cases nationwide, the highest annual total in more than 30 years. Nearly all were linked to outbreaks rather than single imported cases, a key indicator of weakening disease control.

Public health officials emphasize that measles elimination does not mean zero cases. The designation, achieved in 2000, reflects the absence of sustained domestic transmission. If a single chain of transmission continues uninterrupted for 12 months or more, the United States could formally lose its elimination status.

A preventable disease once thought defeated

Before the introduction of the measles vaccine in 1963, measles was nearly universal in childhood. Millions of Americans were infected each year. Hundreds died annually, and thousands suffered complications such as pneumonia, brain inflammation, hearing loss, and permanent disability. In the early 20th century, measles killed an estimated 6,000 Americans per year.

The introduction of widespread vaccination transformed that reality. Two doses of the measles mumps, and rubella (MMR) vaccine are about 97 percent effective. When vaccination coverage remains high, around 95 percent community immunity prevents sustained transmission and protects vulnerable populations.

Why measles is spreading again

Measles is one of the most contagious viruses known. It spreads through the air and can linger in enclosed spaces for hours after an infected person leaves. Even small declines in vaccination coverage can create pockets of susceptibility where the virus spreads rapidly once introduced.

Public health officials say many of the current cases are occurring among unvaccinated individuals or in communities with low routine childhood immunization rates. Disruptions during the COVID-19 pandemic, combined with a growing mistrust of vaccines, have widened these gaps.

Expert warning about Measles

Dr. Paul Offit, a pediatric infectious disease specialist and one of the nation’s leading vaccine experts, has warned that the resurgence reflects a dangerous erosion of public memory.

“We eliminated measles, but we also eliminated fear of measles,” Offit has said in recent interviews. He has repeatedly emphasized that measles is not a harmless childhood illness. About one in five unvaccinated people who contract measles in the United States require hospitalization, and roughly one in 1,000 children develop encephalitis, which can lead to permanent brain damage or death.

“There is no medical shortcut here,” Offit has said. “Vaccination is what stops measles. When vaccination rates fall, measles comes back.”

Politics and vaccine hesitancy

Public health experts say political rhetoric is increasingly influencing vaccine attitudes. Under the Trump administration, skepticism toward vaccines has gained prominence at the federal level, particularly following the appointment of Robert F. Kennedy Jr. as Secretary of Health and Human Services.

Kennedy has a long history of questioning vaccine safety, claims that have been repeatedly rejected by major medical and scientific organizations. Pediatricians and infectious disease specialists warn that when doubts about vaccines are amplified from the highest levels of government, they can undermine public trust and embolden misinformation, especially during active outbreaks.

What public health officials say must happen next

Medical experts, including Dr. Paul Offit, a pediatric infectious-disease specialist at Children’s Hospital of Philadelphia; Dr. Rochelle Walensky, former director of the Centers for Disease Control and Prevention; and Dr. William Schaffner, professor of preventive medicine and infectious diseases at Vanderbilt University Medical Center, agree that reversing the trend will require urgent action, restoring high MMR vaccination coverage, strengthening outbreak response efforts, and delivering consistent, science-based public messaging.

Without decisive intervention, public health officials warn, measles could regain a permanent foothold in the United States, reversing decades of progress and putting children and vulnerable adults at renewed risk from a disease once considered a public-health victory.