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I read that this year's U.S. flu shot protects against 3 or 4 strains of influenza. If you get the flu, haven't yet had your shot, and the doctor OKs it, you can get the flu shot after you recover from one strain of flu in order to protect yourself from the other strains.
If there are still other flu strains going around your area then the flu shots won't protected you from those strains. That's where our other precautions, like washing hands and avoiding people who are sick, come into play.
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