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| Area | Province | Sampled(n) | Positive(n) | Rate(%) |
| Central | Henan | 980 | 14 | 1.43% |
| Hunan | 1531 | 6 | 0.39% | |
| Hubei | 1122 | 0 | 0.00% | |
| East | Anhui | 821 | 0 | 0.00% |
| Zhejiang | 889 | 3 | 0.34% | |
| Fujian | 1459 | 10 | 0.69% | |
| Shandong | 1131 | 3 | 0.27% | |
| Shanghai | 716 | 2 | 0.28% | |
| Northwest | Shaanxi | 1159 | 6 | 0.52% |
| Gansu | 851 | 4 | 0.47% | |
| Qinghai a | 2684 | 98 | 3.65% | |
| Northeast | Heilongjiang a | 272 | 0 | 0.00% |
| Jilin a | 187 | 0 | 0.00% | |
| North | Neimenggu a | 670 | 3 | 0.45% |
No samples were collected in 2004.
