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The information of the samples collected from each province from 2018 to 2021.
| Year | Number of Samples | |||||||
|---|---|---|---|---|---|---|---|---|
| Henan | Hubei | Jiangsu | Shandong | Guangdong | Hunan | Jiangxi | Sichuan | |
| 2018 | 241 | 242 | 201 | 220 | 231 | 257 | 211 | 298 |
| 2019 | 225 | 217 | 177 | 211 | 203 | 221 | 197 | 271 |
| 2020 | 317 | 266 | 232 | 259 | 254 | 286 | 237 | 322 |
| 2021 | 188 | 147 | 141 | 167 | 153 | 171 | 148 | 196 |
