A good thing to remember during the flu season is that cold and flu are spread by droplets. They get on your mucus membranes, like nose and mouth. It takes them a bit to get into your system, so blow your nose a couple of times a day, and gargle. Reduces the risk that they will take up residence. That is a huge reason for washing hands, so you don't transmit them from your hands to your own mucus membranes. DON'T touch your face!