Table 1. Description of sampling of poultry or poultry-related environments for detection of avian influenza viruses and information on number and provenance of H3N8 viral isolates, China, September 2021−May 2022 (n = 38,639 samples collected).
| Period | Location | Number of samples collected | Number of provinces investigateda | Number of H3N8 virus isolates | Provinces found with H3N8 virus | ||
|---|---|---|---|---|---|---|---|
| Total | Number per origin | Number | Names | ||||
| Sep−Dec 2021 | Market | 8,223 | 19 | 9 | 6 from chicken | 3 | Fujian, Guangdong, Zhejiang |
| 3 from ducks | |||||||
| Farm | 9,107 | 23 | 5 | 5 from ducks | 2 | Hubei, Jiangxi | |
| Slaughterhouse | 1,622 | 9 | 1 | 1 from ducks | 1 | Zhejiang | |
| Jan−May 2022 | Market | 9,422 | 16 | 81 | 61 from chicken | 10 | Anhui, Fujian, Guangdong, Guangxi, Guizhou, Henan, Hunan, Jiangsu, Ningxia, and Zhejiang |
| 14 from ducks | |||||||
| 3 from geese | |||||||
| 3 from the environment | |||||||
| Farm | 9,584 | 23 | 2 | 2 from ducks | 1 | Anhui | |
| Slaughterhouse | 681 | 5 | 0 | Not applicable | 0 | Not applicable | |
a A total of 25 provinces were investigated over the study period.