evidence: Measles is a highly contagious respiratory virus that can cause serious disease and death. Measles vaccines are safe and effective at preventing measles — and are among some of the most cost-effective vaccines. However, millions of children worldwide have missed measles vaccines. [...] Following years of declines in measles vaccination coverageA, measles cases in 2022 increased by 18% and deaths increased by 43% globally (compared to 2021). In 2023, nearly 35 million children missed at least one lifesaving measles vaccine dose. [...] Measles vaccines are one of the most cost-effective vaccines available: 2 doses of this vaccine costs less than $2 per child. Vaccination coverage of at least 95% prevents measles outbreaks.