Table 4. Comparison of nucleotide sequence similarity from the 13 study isolates with several other H9N2 subtype isolates available in GenBank (%).
| 13 recent isolates | Clade | ||||||
|---|---|---|---|---|---|---|---|
| h9.1a | h9.2b | h9.3c | h9.4.1d | h9.4.2e | |||
| 13 recent isolates | 96.2–100 | ||||||
| Clade | h9.1a | 68.9–71.6 | |||||
| h9.2b | 71–73.6 | 76 | |||||
| h9.3c | 72.6–75.1 | 79.2 | 77.6 | ||||
| h9.4.1d | 77.8–80.3 | 75.1 | 67.6 | 83.7 | |||
| h9.4.2e | 91.5–93.6 | 75.9 | 69.2 | 79.5 | 83.6 | ||
a
h9.1 represented by A/turkey/California/189/66.
b
h9.2 represented by A/shorebird/Delaware/9/96/189/66.
c
h9.3 represented by A/duck/Hong_Kong/Y439/97.
d
h9.4.1 represented by A/quail/Hong_Kong/G1/97.
e
9.4.2 represented by A/duck/Hong_Kong/Y280/97.