Mary Gallagher, RN, MSN, CCRN
THE FLU, ALSO KNOW AS INFLUENZA, is a respiratory infection caused by several viruses. The viruses pass through the air and enter your body through your nose or mouth. Between 5 and 20 percent of the U.S. population gets the flu each year. The flu can be serious or even deadly for elderly people, newborn babies, young children and individuals with certain chronic illnesses. The best way to prevent flu is by getting a flu vaccine each year.