Measles Resurgence: A Global Health Concern

A concerning rise in measles cases is being observed across the globe, including in the United States, the United Kingdom, and Israel. This resurgence of a highly contagious and potentially serious disease raises questions about declining vaccination rates and the potential for wider outbreaks. This article provides an overview of the current situation, the factors contributing to the increase, and the potential consequences.

Measles Cases on the Rise

In the United States, the Centers for Disease Control and Prevention (CDC) has reported a significant increase in measles cases. As of February 17, 2026, 937 cases have been recorded this year, a substantial increase from the 283 cases reported in 2024 and the 63 cases in 2023. South Carolina currently leads the nation with 622 cases.

The majority of those affected are young people, with 25% of cases occurring in children under 5 years old and 58% in children and adolescents aged 5 to 19. Critically, 95% of those infected were unvaccinated or had an unknown vaccination status, while the remaining 5% had only received one dose of the measles, mumps, and rubella (MMR) vaccine.

Declining Vaccination Rates

Vaccination rates in the U.S. Have been declining. The vaccination rate among children in daycare centers fell from 95.2% in 2019-2020 to 92.5% in 2024-2025, leaving approximately 286,000 toddlers vulnerable to the disease. Nationwide, a dozen states maintain vaccination rates above 95%, while a fortnight have rates below 90%.

Situation in the United Kingdom

The United Kingdom is also experiencing a measles outbreak, particularly in northeast London. Between January 1 and February 9, 2026, 96 cases were confirmed, primarily among children under 10 in Enfield. This area has one of the lowest MMR vaccination rates, with 35% of children unvaccinated in 2024-2025.

Great Britain lost its “measles-free” status in late 2023, with 2,911 laboratory-confirmed cases in 2024. In 2025, 657 cases were confirmed, with 68% affecting children under 10. A child’s death in Liverpool last summer due to measles complications did not significantly boost vaccination rates.

Outbreaks in Israel

Israel has also seen a resurgence of measles, with an outbreak in ultra-Orthodox communities resistant to vaccination resulting in 2,900 cases and 19 deaths, primarily among children. Similar outbreaks occurred in 2003-2004, 2007-2008, 2018-2019, following the same pattern of importation and localized transmission.

The Cost of Vaccine Hesitancy

Epidemiologists in the UK have modeled the potential consequences of vaccine hesitancy. Assuming a 3% parental refusal rate for measles vaccination, the country could experience two major epidemics over the next 20 years, resulting in nearly 400,000 cases, 4,802 deaths, and £292 million in losses.

Long-Term Impacts and Immune Amnesia

Research suggests that measles can have long-term health consequences, including immune amnesia – a loss of immunity to other diseases, potentially requiring revaccination.

Global Trends

While 2025 saw a decline in measles cases in Europe and Central Asia (-75%), numbers remain higher than those seen in the 2000s. In Florida, there are moves to expand vaccination exemptions.

The resurgence of measles underscores the importance of maintaining high vaccination coverage to protect individuals and communities from this preventable disease.