Anti-CA/07/09 serum antibody titers as determined by standard HI assays using turkey red blood cells and A/California/07/2009 virus. *indicates transmitting pair.
(A) Alignment of A/Shanghai/02/2013 and A/Netherlands/219/2003 HA amino acid residues 130 to 310. Predicted antigenic sites A (pink), B (orange), C (purple), D (yellow), and E (blue) are highlighted.
