Butfirstsincethereareliterallythousandsofinfluenzavariants, theWorldHealthOrganizationmustdeterminethefourstrainsmostlikelytocirculateeachyeargenerallytobeviruseswhichaffecthumansandto a virusesthatcaninfectanimalsaswelllikeswineflu.
Butdon't worrysinceourbloodalreadycontains 13,000 microgramsofformaldehyde, theextra .8 in a typicaldose, barelyregisterswhilescienceprovidesourannualshotatstayinghealthy.