I work in an office where everyone is constantly sneezing, coughing, or carrying some bug. I get the flu shot every year and have not gotten sick once. They all know I am on immunosuppresants so they try to stay away but we all use the same fax, copier, lunch room, etc. Try to keep yourself as healthy as possible and you should be okay. When I was younger, I used to get sick all the time. I have been on Imuran foor three years and have maybe had one cold. I wouldn't worry too much. You should be okay!