I have reached the point in my life where I don't try to avoid it. I just tell the sick people to not worry about it and just get me sick as well. It's going to happen even if you try to isolate yourself and stay away from everyone. Like i just told @bozz , I just use the time when everyone else is sick and I am not yet to head to the pharmacy / chemist and stock up. I'm gonna need that stuff so may as well do my shopping while I am still feeling well. If i get lucky and i don't get it, save it for next time because next time will happen.