Table 1. Zoonotic influenza A viruses affecting humans.
| Influenza A virus subtype | Number of confirmed human cases | Number of deaths | Airborne transmission between mammals | Subtype able to transmit between humans |
|---|---|---|---|---|
| Avian H5 (H5N1) | 661 13 | 387 | Y 14,15,16 | N |
| Avian H7 (H7N2, H7N3, H7N7, H7N9) | 240 13,17,18,19,20,21 | 46 | Y 22,23,24,25 | N |
| Avian H9 (H9N2) | 5 26,27,28 | 0 | Y 29 | N |
| Avian H6 (H6N1) | 1 30 | 0 | NDa | N |
| Avian H10 (H10N7) | 2 31 | 0 | ND | N |
| Swine H3 | 348b 32 | 0 | Y 33 | Y |
| Swine H1 (H1N1, H1N2) | 21b 32 | 0 | Y 34 | Y |
a
ND, not determined.
b
Reported since 2005.