front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |16 |17 |18 |19 |20 |21 |22 |23 |24 |25 |26 |27 |28 |29 |30 |31 |32 |33 |34 |35|36 |37 |38 |39 |40 |41 |42 |43 |44 |45 |46 |47 |review

Influenza A has subtypes H3N2, H1N1 (common human) H7N7 (avian 2003, The Netherlands) H5N2 (avian vaccine) H9N2 (human case in Hong Kong, SAR China, 2003) H5N1 (current avian strain of concern)