| Years | PCV-2a single positive ratio | PCV-2b single positive ratio | PCV-2a/2b co-infected ratio | Total |
| 2009 | 13.33% (2/15) | 86.67% (13/15) | 0 (0/15) | 15 |
| 2010 | 4.17% (3/72) | 91.67% (66/72) | 4.17% (3/72) | 72 |
| 2011 | 16.88% (13/77) | 75.32% (58/77) | 7.79% (6/77) | 77 |
| Total | 10.98% (18/164) | 83.54% (137/164) | 5.49% (9/164) | 164 |