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Prevalence of antibodies to PCV2 in pig sera collected from Henan, Hunan, and Beijing
| Areas | Positive | Negative | Total | Positive rate |
|---|---|---|---|---|
| Beijing city | 371 | 6 | 377 | 98.4 % |
| Hunan province | 348 | 84 | 432 | 80.6 % |
| Henan province | 387 | 101 | 488 | 79.3 % |
| Total | 1106 | 191 | 1297 | 85.3 % |
