The World Cup is presenting a unique challenge for public health officials. Dozens of teams from around the globe — along with millions of their dedicated fans — will descend on major U.S. cities in the coming weeks. It’s the largest in FIFA history, with 39 teams setting up training camps in the United States. The first match in this country will be June 12 in California, with the last match more than a month later, on July 19, in New Jersey. The scale is unlike that of the Super Bowl or even