| CI | Confidence interval |
| Ct | Cycle threshold |
| PCVs | Porcine circoviruses |
| PCV1 | Porcine circovirus type 1 |
| PCV2 | Porcine circovirus type 2 |
| PCV3 | Porcine circovirus type 3 |
| PCV4 | Porcine circovirus type 4 |
| PCVAD | porcine circovirus-associated disease |
| qPCR | Quantitative polymerase chain reaction |
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