One afternoon, you’re at work when your stomach starts cramping, and you make a run for the bathroom. You make it just in time! This happens several more times before you finally decide to go home. You don’t really become concerned until you notice there’s blood in your stool. You go to the doctor, and he suspects you might be infected with shigella. What is this? How serious is it? What do you need to do to get rid of it?