With fall right around the corner, many people try to take precautions against coming down with a cold or the flu. Not only is getting sick a nuisance, but catching the flu could have more serious consequences — particularly for children, seniors and pregnant women. How do you prepare your bodys immune system to fight off the viruses that cause these illnesses? Wash your hands: You only get sick if viruses enter your body, which usually occurs when you touch your nose or mouth after...