Influenza A virus: Influenza viruses are categorized as influenza a or influenza b. Influenza a is the more common and more serious one. Usually two of the 3 strains in each influenza vaccine are influenza a viruses.
Answered 1/1/2016
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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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