Table 1 Comparison of amino acid residues at specific positions in the HA and NA gene
| Â | HA | NA | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Strain | Receptor binding site | Cleavage site | Stalk deletion | HB site | |||||||
|  | 189 | 190 | 226 | 227 | 333–340 | 38–39 | 62–65 | 366–373 | 402 | 403 | 432 |
Isolate1 | T | A | L | I | PARSSR↓GL | No | No | IKKDSRAG | N | W | R |
Isolate2 | T | A | Q | I | PARSSR↓GL | No | No | IKKDSRAG | N | W | Q |
A/chicken/Chandigarh/2048/2003 | T | A | L | I | PARSSR↓GL | No | No | IKKDSRAG | N | W | NA |
A/chicken/Haryana/2424/2004 | T | A | L | I | PARSSR↓GL | No | No | IKKDSRAG | N | W | NA |
A/chicken/India/IVRI-0004/2010 | T | A | L | I | PAKSSR↓GL | No | No | IKRDSRAG | N | W | Q |
A/chicken/India/WB-NIV1057231/2010 | T | V | L | I | PARSSR↓GL | No | No | IKEDSRAG | N | W | Q |
A/chicken/Orissa/2317/2004 | T | A | L | I | PARSSR↓GL | No | No | IKKDSRAG | N | W | NA |
A/chicken/Tripura/105131/2008 | T | A | L | I | PAKSSR↓GL | No | No | INKDSRAG | N | W | R |
A/chicken/Uchal/8293/2006 | T | A | L | I | PARSSR↓GL | No | No | IRKDSREG | N | L | Q |
A/watercoot/Haryana/5844/2005 | T | A | L | I | PARSSR↓GL | No | No | IKKDSRAG | N | W | Q |
A/Quail/Hong Kong/G1/97 H9N2 | T | E | L | Q | PARSSR↓GL | Yes | No | IKKDSRSG | I | R | Q |
A/duck/Hong Kong/Y280/97H9N2 | T | T | L | Q | PARSSR↓GL | No | Yes | IKEDSRSG | N | W | Q |
A/turkey/Wisconsin/1/1966H9N2 | T | E | Q | Q | PAVSSR↓GL | No | No | ISKDSRSG | N | W | Q |