Map: Most States Are at Risk for Measles Outbreaks

Why It Matters

The declining measles immunization rates threaten to reverse two decades of disease elimination, exposing schools and communities to costly outbreaks and straining public‑health resources.

Key Takeaways

• U.S. measles cases jumped from 13 in 2020 to over 2,200 in 2025
• Kindergarten vaccination rates fell below 95% target, hitting only 10% in 2024‑25
• Unvaccinated children account for 90% of measles cases among under‑five age group
• South Carolina’s outbreak ended as vaccination uptake rose, showing policy impact

Pulse Analysis

The recent measles resurgence reflects a perfect storm of pandemic‑era disruptions and lingering vaccine hesitancy. During COVID‑19, routine childhood immunizations slipped as families avoided clinics and misinformation about the new coronavirus vaccine seeped into broader health attitudes. Studies show that roughly four in ten Republicans still believe COVID‑19 vaccines caused more deaths than the virus itself, eroding trust in public health messaging and depressing measles‑vaccine uptake across the political spectrum. This decline has pushed national coverage well below the 95% threshold needed for herd immunity, creating pockets where the virus can spread unchecked.

From an economic and operational standpoint, measles outbreaks impose steep costs on schools, hospitals, and insurers. Unvaccinated children are 90% more likely to contract the disease, and 30% of 2025 cases occurred in children under five, a demographic that requires intensive care when infected. Outbreaks trigger school closures, quarantine protocols, and expensive contact‑tracing efforts that divert resources from other health priorities. Moreover, the indirect impact on workforce productivity—parents missing work to care for sick children—adds a hidden financial burden that can ripple through local economies.

Policymakers now face a clear imperative: restore confidence in routine vaccinations and reinforce the infrastructure that supports them. Federal agencies must prioritize transparent communication, counter misinformation, and fund community‑based outreach programs that make vaccines accessible in underserved areas. State officials, as demonstrated in South Carolina, can leverage localized campaigns to boost uptake and swiftly contain outbreaks. Long‑term, integrating vaccination data into AI‑driven surveillance tools could provide early warnings, allowing health departments to intervene before cases spiral. Rebuilding herd immunity is essential not only for measles but for safeguarding the broader public‑health gains achieved over the past two decades.