Measles Return: US Losing Ground in Fight Against Infectious Diseases

The return of measles to the United States, once a rare occurrence, is no longer making headlines with each new outbreak – a worrying sign of deeper vulnerabilities in the country’s public health infrastructure. After decades of relative control, measles is circulating continuously across the U.S., with over 1,300 infections confirmed as of March 6, 2026, putting the nation on track to surpass the highest case numbers in 35 years. The outbreaks, beginning with a significant surge in Texas in 2025, have spread to multiple states, including ongoing activity in Utah, Arizona and South Carolina.

A Cascade of Outbreaks

The current situation marks a stark contrast to the period between 1993 and 2024, when measles cases were limited to a few hundred annually. The initial outbreak in Texas lasted from January to August 2025, followed quickly by outbreaks on the Utah and Arizona border beginning in August, and in South Carolina starting in September. The South Carolina outbreak saw a drastic increase in cases beginning in January 2026 and continues to spread. Thirty states have reported measles cases this year, with 47 states experiencing cases since the start of 2025.

Experts studying outbreak preparedness and response at Brown University’s Pandemic Center view this resurgence as a grim warning about the U.S.’s capacity to manage infectious disease threats. The core issue is declining vaccination rates: around 90% of the population has received the MMR vaccine, but in some regions, that number falls below 60%, well short of the 95% needed for herd immunity. Maintaining sufficient vaccination rates at both the national and local levels is crucial to prevent the virus from finding and exploiting pockets of unvaccinated individuals.

The Loss of “Elimination” Status

The U.S. Achieved measles elimination in 2000, defined as continuous transmission being halted for 12 months. However, current trends suggest the country may lose this status, alongside Mexico, which is also battling outbreaks. The Pan American Health Organization (PAHO) initially scheduled a review in April 2026 to determine whether the U.S. Would retain its elimination status, but has since postponed the meeting until November. Canada lost its measles-free status in November 2025, and the U.S. Appears to be following a similar trajectory, with vaccination rates falling below the critical 95% threshold in all three countries and potential epidemiological links between the outbreaks.

The consequences of losing elimination status extend beyond increased cases. In 2025, three people in the U.S. Died from measles – the highest number in 25 years. Approximately 11% of those infected required hospitalization. In South Carolina, where the majority of cases have been reported in 2026, hospitals are not required to report measles-related hospitalizations, meaning the actual number of severe cases could be significantly higher.

Beyond the Immediate Illness

Measles isn’t simply a fever and rash. The virus can lead to serious complications, including pneumonia, which can be fatal, and encephalitis, which can cause deafness or intellectual disabilities. Even after recovery, measles can have long-term effects. The virus can affect the immune system, increasing susceptibility to other infections, and, in rare cases, can lead to subacute sclerosing panencephalitis (SSPE), a progressive dementia that always results in death. A school-age child in Los Angeles recently died from SSPE years after being infected with measles as an infant, before they were eligible for vaccination.

The economic costs of recurring measles outbreaks are also substantial. Studies have shown that containing outbreaks can cost tens of thousands of dollars per case. A 2018-2019 outbreak in Washington state, involving 72 cases, cost $3.2 million for public health response, medical expenses, and productivity losses. A sustained 1% drop in MMR coverage could cost the U.S. Billions of dollars across healthcare systems and the economy, according to the Common Health Coalition.

A Warning Sign for Public Health

The resurgence of measles serves as a broader warning about the state of public health preparedness in the U.S. The ability to control measles is a proxy for the ability to manage other infectious diseases, as it relies on the same core strategies: vaccination, case detection and isolation, contact tracing, and safe treatment. However, public trust in these strategies, and in public health institutions like the Centers for Disease Control and Prevention (CDC), is eroding. Recent polling data indicates that less than half of Americans trust the government to provide reliable vaccine information.

These cracks in the public health infrastructure will complicate efforts to protect Americans from future disease threats, whether from outbreaks, pandemics, or even biological attacks. The current situation demands a renewed focus on strengthening vaccination programs, rebuilding public trust in public health institutions, and investing in robust surveillance systems to detect and respond to emerging threats.

Looking Ahead: Strengthening Surveillance and Response

The CDC continues to monitor measles cases and provide guidance to state and local health departments. Ongoing surveillance is critical to identify outbreaks early and implement effective control measures. Further research is needed to understand the factors driving declining vaccination rates and to develop strategies to address vaccine hesitancy. The PAHO’s review in November will be a key moment for assessing the U.S.’s progress towards maintaining measles elimination, and will likely inform future public health policies.

You can find more information about measles and vaccination from the Centers for Disease Control and Prevention and the Pan American Health Organization.