TABLE 1.
Highly represented amino acid residues in prevalent G1-like M genes from chicken H9N2 viruses in China
| Mutation | Time of emergence (yr) | Prevalence in chicken H9N2 influenza viruses (%)a |
||
|---|---|---|---|---|
| With G1-like M gene from major group | With G1-like M gene from nonmajor group | With BJ/94-like M gene | ||
| M1-37A | 2007 | 73.54 | 5.77 | 1.34 |
| M1-95K | 2008 | 96.25 | 4.81 | 0.45 |
| M1-224N | 2008 | 93.44 | 0.96 | 0.45 |
| M1-242N | 2006 | 96.02 | 4.81 | 0 |
| M2-21G | 2007 | 85.48 | 2.38 | 2.23 |
a
The total numbers of the viruses with either the G1-like M gene from the major group, the G1-like M gene from the nonmajor group, or the BJ/94-like M gene are 427, 104, and 224, respectively.