I don't think I have ever caught anything from my gym except for maybe a cold (sometimes hard to avoid airborne stuff). However, I do carry my gym bag around with me and it does constantly touch the floor. When I get in my car, I put it on the floor mats and when I get home I leave it in my garage. Also, at the gym I will sanitize equipment before I use it just incase the person before me didn't, but if I am extra cautious I will use hand sanitizer between equipment (my gym has it available on the walls). When I am about to leave, I make sure the thoroughly wash my hands before I leave and after that's complete I remove my headphones (don't want to get near my face with dirty hands). So far, so good. Just be diligent and also like others were saying, most people do not go to the gym when they are ill or even days after. Also you can wipe all that stuff down like once a week just to be sure.