More than 6.5 million people are expected to attend the World Cup this summer at stadiums across Canada, the U.S. and Mexico. One of the largest sporting events in world history, the tournament is presenting unique infectious disease challenges for public health officials. To help, spatial epidemiologist Professor Will Goedel has developed an interactive map to track the movements of World Cup teams and their fans. He explains how his live-updated tracking map is helping health departments, and how it might be able to prevent a disease outbreak before one starts.