Global measles cases rose 20% in a year as vaccination coverage stalled

Measles is climbing again because the vaccination that holds it back has stopped gaining ground. WHO and CDC estimate that global measles cases rose about 20% in a single year, from 8,645,000 in 2022 to 10,341,000 in 2023, and that the number of countries experiencing large or disruptive outbreaks jumped from 36 to 57 over the same period [s1].

The figures come from the latest global measles elimination assessment, which tracks the disease across all six WHO regions [s1]. Its central finding is not a new variant or a failure of the vaccine — which remains highly effective — but a stall in how many children get it. Global coverage with the first dose of measles-containing vaccine (MCV1) fell to 81% during the COVID-19 pandemic, the lowest level since 2008, recovered to 83% in 2022, and then did not move in 2023 [s1]. Because measles is among the most contagious diseases known and needs roughly 95% two-dose coverage to interrupt transmission, a global first-dose rate stuck in the low 80s leaves millions of children unprotected and lets outbreaks reignite [s1].

Why deaths fell as cases rose

The report contains an apparent paradox: even as estimated cases rose 20%, estimated measles deaths fell 8%, from 116,800 in 2022 to 107,500 in 2023 [s1]. That is not good news dressed up as bad. The decline happened primarily because a larger share of the year's cases occurred in countries with lower risk of death — better-resourced health systems where a child with measles is more likely to survive — rather than because the disease became less dangerous [s1]. Where cases shift toward low-income and fragile, conflict-affected settings, the same case count produces far more deaths.

WHO's more recent estimate continues that trajectory: it puts measles deaths at about 95,000 in 2024, down from 780,000 in 2000, and credits vaccination with averting nearly 59 million deaths between 2000 and 2024 [s2]. Before a vaccine became available in 1963, major epidemics recurred every two to three years and caused an estimated 2.6 million deaths annually [s2]. The long arc is one of enormous progress; the recent years are a warning that the progress is not self-sustaining.

Why the case count is what kills

Measles is rarely just a rash. Most measles deaths come from complications — including pneumonia, diarrhoea, and encephalitis, an infection of the brain that can cause permanent damage, alongside blindness [s2]. Because those complications fall hardest on unvaccinated or under-vaccinated children under five, the disease behaves as an amplifier of every other weakness in a health system: malnutrition, weak primary care, and gaps in vitamin A all raise the odds that an infection becomes a death [s2]. That is the mechanism behind the report's central paradox — a fifth more cases but fewer deaths in 2022–2023 — because the year's extra infections landed disproportionately in countries better equipped to keep sick children alive [s1].

It is also why coverage, not case counts, is the number to watch. A first dose alone is not enough: interrupting transmission requires that roughly 95% of children receive two doses, and global first-dose coverage stuck at 83% in 2023 implies an even larger shortfall on the second dose [s1]. Every percentage point of coverage that fails to recover leaves a cohort of susceptible children who accumulate year over year until an imported case finds them [s1].

No region has reached the finish line

Every WHO region has committed to eliminating measles, yet none had achieved and maintained elimination as of the end of 2023 [s1]. Coverage is lowest, and incidence highest, in low-income countries and in fragile, conflict-affected and vulnerable settings, which compounds existing health inequities [s1]. WHO's most recent coverage figure — MCV1 at 84% in 2025, still below the 86% reached in 2019 — shows the pandemic-era gap has not closed [s2].

The practical reading is narrow and firm. The tools work: two doses of measles vaccine reliably prevent disease, and vaccination has already saved tens of millions of lives [s1][s2]. The problem is reach. Until first- and second-dose coverage climbs back toward the level needed for herd immunity — and until the children being missed in the poorest and most disrupted places are reached — the case counts in reports like this one will keep rising, and the fragile settings that carry the highest death risk will keep absorbing the largest share of the harm [s1].

This article is informational and is not medical advice.

Sources

• [s1] "Progress Toward Measles Elimination — Worldwide, 2000–2023," Morbidity and Mortality Weekly Report (CDC), on behalf of WHO and partners, 14 November 2024. https://doi.org/10.15585/mmwr.mm7345a4
• [s2] World Health Organization, "Measles" (fact sheet), reflecting 2024 mortality and 2025 coverage estimates. https://www.who.int/news-room/fact-sheets/detail/measles