As athletes and millions of fans gear up for the FIFA World Cup starting next week, global health officials are preparing for a high-stakes challenge of their own: protecting against infectious diseases. For the first time, the tournament will span 16 host cities across three countries — the United States, Canada and Mexico — and feature 48 teams, making it the largest World Cup in history. The event also comes amid an Ebola outbreak in Congo and Uganda that the World Health Organization has