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Strains of H2N2 and H3N2 subtypes showing N66S mutation in the PB1F2 protein from a various hosts
| Mutation | Host | Total no. of strains | N66S mutation (%) |
|---|---|---|---|
| H2N2 | 83 | 24 (28·91) | |
| Human | 54 | 2 (3·70) | |
| Avian | 22 | 16 (72·7) | |
| Environment | 1 | 1 (100) | |
| Guinea pig | 6 | 5 (83·3) | |
| H3N2 | 2566 | 89 (3·96) | |
| Human | 2419 | 30 (1·24) | |
| Avian | 68 | 53 (77·94) | |
| Swine | 76 | 3 (3·94) | |
| Environment | 16 | 2 (12·5 | |
| Dog | 1 | 1 (100) |
