Probably somewhat slim, first someone has to be sick to give it to you, then the entity has to be infective enough to survive on a surface, and anything really bad would close the place down. You have an immune system, you are exposed thousands of times a day to things. More common is someone sneezing or coughing in your direction, than from an inanimate object like that. But its not impossible--more likely in things like flu season, or if a measles case was there. But over all, fairly slim.