Table 5 Top five combination subtypes of AIVs, HuIVs, SIVs, EIVs, and CIVs with the relevant strain numbers given in parentheses
| Â | First | Second | Third | Fourth | Fifth |
|---|---|---|---|---|---|
AIVs | H5N1 (1931) | H9N2 (1753) | H5N2 (641) | H3N8 (633) | H4N6 (542) |
HuIVs | H3N2 (6816) | H1N1 (6328) | H5N1 (215) | H2N2 (80) | H7N9 (59) |
SIVs | H1N1 (2375) | H1N2 (1945) | H3N2 (1737) | H3N1 (34) | H5N1 (19) |
EIVs | H3N8 (808) | H7N7 (24) | H5N1 (1) | H9N2 (1) | Â |
CIVs | H3N8 (217) | H3N2 (60) | H5N1 (4) | H3N1 (2) | Â |