Table S1. Poultry environment investigation and testing.
| Case No. | Region | Source of poultry | Poultry species | Specify the upstream supplier | Poultry species of upstream supplier | qPCR of poultry environment | qPCR of upstream supplier environment | qPCR of living environment |
| *ND: Not done. | ||||||||
| 1 | Jinjiang, Chengdu | Market | Chicken, duck | Chenghua district market | Chicken, duck | + | + | + |
| 2 | Kaijiang, Dazhou | Domestic | Chicken, duck | Luo's chicken and duck farm | Chicken, duck | + | + | + |
| 3 | Xuanhan, Dazhou | Domestic | Chicken, duck | Yunchengzhai chicken farm | Chicken, duck | + | + | + |
| 4 | Bazhou, Bazhong | Domestic | Chicken, duck, goose | Not purchased in 2021 | Not purchased in 2021 | + | ND* | + |
| 5 | Nanxi, Yibin | Domestic | Chicken | Private vendors in Wangjia town | Chicken | + | ND | – |