Any time people from around the world gather together, the risk of certain diseases goes up. With the World Cup underway, health experts are on alert for infectious diseases. Here are some tips from infectious-disease and public-health experts about what to worry about, what not to worry about, and how to best protect yourself. Hantavirus and Ebola have been in the headlines. How worried should I be if I’m attending a match? The risk of getting infected with either virus remains low for the