Whichever one you get, you need to get a new vaccine every year. Why? Because the flu virus changes every year and the vaccine is specially created to fight the viruses that are going to be a problem that year.
How Does the Flu Spread?
This virus gets around in little drops that spray out of an infected person's mouth and nose when he or she sneezes, coughs, or even laughs. You can catch the flu from someone who has it if you breathe in some of those tiny flu-infected drops. You can also catch the flu if those drops get on your hands and you touch your mouth or nose. No wonder people are always saying to cover your mouth when you sneeze!

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