There are numerous: strains of flu virus & flu viruses often mutates. So your body would have to build immunity against many types of viruses - not just one. That is why it is important to get your flu shot - it protects against selected strains that are projected to cause problems in each upcoming flu season.
Answered 10/20/2014
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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