The World Health Organization (WHO) removed the United Kingdom, Spain, Austria, Armenia, Azerbaijan and Uzbekistan from the list of measles-free countries.[1] The decision was taken in September last year based on data from 2024, but published only on Monday after the consent of the affected states.[1] For a country to acquire or maintain measles-free status, no locally transmitted case of the same strain must occur within 12 months.[1] The UK's change of status reflects a wider challenge in the WHO European Region.[1] Measles transmission occurs regularly in countries such as France and Romania.[1] Canada lost this status last year, and the number of infections is increasing in the US.[1] Measles is completely preventable by vaccination.[1]