The flu virus changes every few years. There are so many kinds of flu and the antibodies for one kind flu cant help us against all kinds of flu. That's why we need to get the vaccine every year.Good health habits may also help keep you away from a cold or flu. Washing your hands...
Because the flu virus changes every few years, there are so many kinds of flu, such as H1N1 and H5N1. The antibodies for one kind of flu can't help you fight against all kinds of flu. 4 All, good health habits (习惯) may also help you from catching a cold or flu. Washing you...