Influenza A virus A/Perth/16/2009 (H3N2) antigen Recommended by WHO for Vaccines: 2011-2012 Northern Hemisphere 2010 Southern Hemisphere 2011 Southern Hemisphere 2012 Southern Hemisphere 2010-2011 Northern Hemisphere vaccine component https://www.fludb.org/brc/fluStrainDetails.spg?strainName=A/Perth/16/2009(H3N2)&decorator=influenza Oliver He influenza A virus (H3N2) antigen