Global Measles Risk Remains High as Vaccination Gaps Persist

GENEVA, SWITZERLAND — Measles continues to exploit gaps in childhood immunization, with global two-dose coverage still far below the level needed to prevent sustained outbreaks.

Global measles transmission remains a major public-health problem in 2026 as millions of children remain insufficiently protected and outbreaks continue to expose weaknesses in routine vaccination systems.

The World Health Organization and UNICEF estimate that only 84% of children worldwide received a first dose of measles-containing vaccine in 2025, while 77% received the recommended second dose. Both figures remain far below the roughly 95% coverage needed in each community to prevent sustained outbreaks of one of the most contagious human viruses.

A recent analysis by infectious-disease epidemiologist Kathryn H. Jacobsen said WHO estimates that nearly 11 million people will contract measles worldwide in 2026, with most infections expected in Africa and Asia. The figure has been widely syndicated since August 21.

However, CRN Times was unable to locate the underlying WHO publication or dataset directly supporting that 2026 estimate. WHO's latest publicly accessible global burden figure reviewed for this article estimates 11 million infections in 2024, along with about 95,000 deaths. The 2026 projection should therefore remain specifically attributed until its primary source is identified.

Measles quickly exposes immunity gaps

Measles is unusually sensitive to even relatively small declines in vaccination coverage because of how efficiently the virus spreads.

WHO describes it as a highly contagious airborne disease transmitted when an infected person breathes, coughs or sneezes. Infection can cause high fever, respiratory symptoms and a characteristic rash, but severe cases can lead to pneumonia, encephalitis, blindness and death.

The virus spreads so readily that public-health agencies generally aim for at least 95% coverage with two vaccine doses in every community rather than relying only on a high national average.

That distinction is important. A country may report relatively strong overall vaccination rates while still containing cities, districts, religious communities, displaced populations or other groups in which coverage is low enough for sustained transmission.

WHO and UNICEF said in July that measles vaccination had effectively stalled globally in 2025: first-dose coverage remained at 84% and second-dose coverage reached 77%. Fifty-seven countries reported large or disruptive outbreaks during the year.

Nearly 60 million deaths prevented since 2000

The current resurgence occurs despite enormous long-term gains from vaccination.

WHO estimates that measles vaccination prevented nearly 59 million deaths between 2000 and 2024. Over the same period, estimated measles deaths fell by 88%.

That progress has not eliminated the disease.

WHO estimated approximately 11 million infections in 2024, almost 800,000 more than in 2019 before the COVID-19 pandemic. Fifty-nine countries experienced large or disruptive outbreaks that year, the highest number since the pandemic began.

An estimated 95,000 people died from measles in 2024, most of them children younger than five.

The contrast illustrates why public-health authorities treat measles as an indicator of wider weaknesses in immunization systems: mortality has fallen dramatically over decades, but transmission can rebound rapidly whenever enough susceptible people accumulate.

Vaccination improved little in 2025

The latest global immunization data offer a mixed picture.

WHO and UNICEF estimate that 13.5 million infants received no routine vaccine at all during their first year of life in 2025. That was an improvement of roughly 750,000 children compared with the previous year, but millions more began vaccination schedules without completing them.

One particularly important gap appeared between early childhood vaccination and measles immunization. About 7.3 million infants received their first diphtheria-tetanus-pertussis dose but did not go on to receive their first measles dose, according to WHO and UNICEF.

The reasons differ sharply between countries.

Conflict and displacement can interrupt routine health services, destroy clinics or make communities inaccessible. Fragile health systems may struggle with staffing, vaccine transport and record keeping. In wealthier countries, falling vaccine confidence and misinformation can create clusters of under-vaccinated children even when supplies are readily available.

Population growth can also make progress difficult: health systems may vaccinate more children in absolute terms while coverage percentages remain stagnant because each year's birth cohort grows.

Outbreaks are not confined to poorer countries

The largest burden remains concentrated in regions where routine immunization gaps overlap with weaker health systems, particularly parts of Africa and Asia. WHO says more than 95% of measles deaths occur in countries with low per-capita incomes and weaker health infrastructure.

But outbreaks are also occurring in higher-income regions.

Europe and Central Asia reported 33,998 measles cases in 2025. That represented a major decline from 127,412 cases in 2024, but WHO and UNICEF warned that continued circulation showed vaccination gaps had not been fully closed.

In the Americas, countries have likewise faced renewed transmission after years in which measles had been eliminated or kept to small imported outbreaks.

The United States, for example, has recorded more than 2,300 confirmed measles cases in 2026, its highest annual total in decades, according to figures cited in recent U.S. public-health research.

Such outbreaks do not mean vaccines have stopped working. They generally occur because enough susceptible people remain unvaccinated or under-vaccinated for the virus to sustain chains of transmission.

Catch-up programs have reached millions

International agencies have tried to close some of the immunity gaps created during and after the COVID-19 pandemic.

The Big Catch-Up initiative, launched by WHO, UNICEF, Gavi and partners in 2023, delivered more than 100 million vaccine doses to an estimated 18.3 million children across 36 countries before concluding in March 2026. About 15 million children reached through the initiative had previously never received a measles vaccine.

Individual countries have also mounted emergency campaigns.

Bangladesh launched a large measles-rubella vaccination drive in April after outbreaks spread across the country. In Rohingya refugee camps in Cox's Bazar alone, more than 166,000 children were vaccinated by May, reaching an estimated 93.7% of the campaign's target population.

Those campaigns can stop outbreaks and protect children who missed routine vaccination, but they do not replace functioning routine immunization systems capable of reaching each new birth cohort.

The central problem is coverage, not a new virus

The current measles problem is therefore not the emergence of a new pathogen or evidence that the existing vaccine has become ineffective.

WHO continues to describe measles vaccination as safe and effective, and decades of global data show that large-scale immunization has prevented tens of millions of deaths.

The challenge is maintaining sufficiently high coverage everywhere.

Because measles spreads faster than most other vaccine-preventable diseases, communities can move from apparent control to a large outbreak relatively quickly when vaccination rates fall.

The most defensible global benchmark currently available is that WHO estimated about 11 million infections in 2024, while 2025 vaccination data show that the underlying immunity gaps remained largely unresolved. A separately cited expert analysis says the burden is expected to remain near 11 million in 2026, but the primary WHO source for that projection still requires verification before CRN Times should present it as an official forecast.