Table. Avian influenza viruses isolated from wild bird samples collected in China, January 2020–December 2021* .
| Date | Province | Sample |
Virus |
|||||
|---|---|---|---|---|---|---|---|---|
| Feces | Swab | Tissue | No. strains | Subtype | Pathotype† | |||
| 2020 | ||||||||
| Jan | Shanxi | 700 | 0 | 0 | 2 | H5N3 | Low | |
| Jan | Heilongjiang | 980 | 394 | 2 | 0 | NA | NA | |
| Nov | Anhui | 1,017 | 0 | 0 | 17 | Multiple‡ | Low | |
| Nov |
Ningxia |
600 |
0 |
4 |
|
1 |
H5N2 |
Low |
| 2021 | ||||||||
| Mar | Anhui | 700 | 0 | 0 | 0 | NA | NA | |
| Mar | Liaoning | 600 | 0 | 0 | 0 | NA | NA | |
| Apr | Ningxia | 450 | 0 | 0 | 0 | NA | NA | |
| Apr | Heilongjiang | 750 | 0 | 0 | 0 | NA | NA | |
| Oct | Heilongjiang | 324 | 113 | 0 | 2 | H5N1 | High | |
| Dec | Shanxi | 500 | 0 | 0 | 4 | H5N1 | High | |
| Dec | Henan | 800 | 0 | 0 | 11 | H5N1 | High | |
*NA, not applicable. †Pathotype is determined by the cleavage motif of its hemagglutinin gene. ‡The 17 low pathogenicity viruses are 1 H2N3, 1 H3N8, 9 H4N6, 3 H5N8, 1 H6N2, 1 H6N8, and 1 H12N2 strains.