| Carlavirus (1) | |
| Closteroviridae (1) | |
| Mosaic virus (6) | |
| Plant virus (17) | |
| Reassortant virus (1) |
Like that responsible for the 2009 pandemic, the new strain, known as Sw/1204, is a'triple-reassortant'virus that is, one with genes from avian, swine and human flu.
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