A member asked:

How come it difficult to prevent humans catching the flu using vaccinations?

A doctor has provided 1 answer
Dr. Heidi Fowler answered

Specializes in Psychiatry

Well, there are: Are different types of influenza ; the viruses can mutate. The vaccination you receive may or may not be a match to the influenza virus that you are exposed to.

Answered 1/4/2014

4.6k views

Thank

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