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Distribution of the Beijing genotype by region.
| Region | Beijing strains n (%) | Pearson’s χ2 value | P-value |
|---|---|---|---|
| Song County | 46 (67.6) | ||
| Zhongmo County | 57 (90.5) | ||
| Xinmi County | 65 (91.5) | 31.76 | <0.0001 |
| Fugou County | 67 (97.1) | ||
| Nanyang County | 64 (87.6) | ||
| Weishi County | 88 (88.9) |
