The World Health Organisation (WHO) has warned that more than half of the world’s countries will be at high or very high risk of measles outbreaks by the end of the year unless urgent preventative measures are taken. The increase in measles cases is mainly due to missed vaccinations during the Covid-19 years, when health systems were overwhelmed and fell behind on routine vaccinations for preventable diseases. The WHO is calling for urgent action to protect children, noting a lack of government commitment due to competing issues like economic crises and conflict. Measles is a highly contagious, airborne virus that mostly affects children under five years old. Cases have been increasing, and outbreaks have been reported in all WHO regions except for the Americas. Death rates are higher in poorer countries due to weaker health systems, but outbreaks and deaths are also a risk for middle and high-income countries.