[Epidemiological surveillance and mass events: lessons learned ahead of the 2026 FIFA™ World Cup].

The FIFA World Cup™ 2026 in Mexico will be a major public health challenge worldwide. Large gatherings can facilitate the spread of diseases, raise the number of cardiovascular emergencies caused by stress, and require careful monitoring of vaccine-preventable illnesses, particularly given ongoing concerns about measles and pertussis. This editorial article reviews lessons learned from past events and highlights the need to improve food safety, mental health support, and active disease surveillance. The healthcare system's success will depend on how well it can respond and plan to manage the risks that come with people traveling from around the world.