MAYBE: Every year a number of flu strains circle the globe and various sites keep track and report their activity. Vaccine makers pick 3-4 strains in early spring to put in the fall shot, based on those with the most activity.Too many strains would weaken the individual strength against each strain.With luck, the vaccine will boost general flu immunity enough to make it mild for those who get it anyway
Answered 3/22/2015
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