Husband always gets a flue shot and always has a cold and/or flue each winter. I never get the shot and can honestly say that I have not had a cold nor the flue in at least 15 years. I am very careful about washing my hands often and I always wear long sleeves out in public so I pull my sleeve down over my hand before opening any public door and I use my elbow to push open public doors. I really believe this is way I avoid picking up those little virus germs that like to attach us.