You don't have a higher chance of getting again because you caught it once, if that's what you're worried about. Both my parents worked in a hospital, my mom was a microbiology lab technician actually so she was the one dealing with all the contaminated samples and stuff. They never got the sv* from work. And you can't catch it from being around people, especially people who aren't sick or haven't been sick recently (like your boss' wife). Keep washing your hands often, it is the best defense against catching most illnesses. Have you considered getting therapy to deal with your fear? It might help.