Table 6.

Summary of associations among PPV, PCVAD, and PRRSV infection together with earlier reports

	This study (Korea)	Study from USA (Opriessnig et al., 2014)	Study from China (Qin et al., 2018)	Study from Poland (Milek et al., 2020)	Study from Mexico (Garcia‐Camacho et al., 2020)
Study design	PPV, PCV2, and PRRSV detection in lungs	PPV and PCV2 detection in lungs	Virome analysis of PRDC-affected and healthy piglets	PPV and PCV2 detection in serum	PPV and PCV2 detection in lungs
Correlation with PPV1	Significantly more detected in PCVAD cases	Significantly more detected in PCVAD cases (p = 0.0048)	n/a	Significantly more detected in PCVAD cases	Not significant
Correlation with PPV2	Significantly more detected in PRRSV cases	Significantly more detected in PCVAD cases (p = 0.0002)	Significantly more detected in PRDC cases (p = 0.005)	Not significant	Not significant
Correlation with PPV3	Not significant	Not significant	Significantly more detected in PRDC cases (p < 0.001)	Significantly more detected in PCVAD cases	Not significant
Correlation with PPV4	Not significant	Not significant	Not significant (p = 0.33)	Not significant	Not significant
Correlation with PPV5	Significantly more detected in both PCVAD- & PRRSV-positive cases	Not significant	Not significant (p = 0.53)	Significantly more detected in PCVAD cases	Significantly more detected in PCVAD cases (p < 0.01)
Correlation with PPV6	Significantly more detected in PCVAD cases	n/a	Significantly more detected in PRDC cases (p < 0.001)	Significantly more detected in PCVAD cases	Significantly more detected in PCVAD cases (p < 0.01)
Correlation with PPV7	Significantly more detected in PRRSV cases	n/a	n/a	Not significant	n/a
Note		No PRRSV data	PCV2 and PRRSV were significantly more detected from PRDC-affected piglets	No PRRSV data Lower PCV2 ct value detected from PPV1- (p = 0.001) or PPV7- (p = 0.006) positive samples	No PRRSV data

n/a, Not applicable; PRDC, Porcine respiratory disease complex