Frequency of PCV-2 viremia in nursery piglets from a Spanish swine integration system in 2020 and 2022 considering PRRSV infection status

Table 2 PCV-2 IgG ELISA mean S/P ratios obtained prior to vaccination (3–4 woa), grouped based on PCV-2 qPCR results at 3–4, 6 and 9 woa in the 48 farms sampled in 2020

	PCV-2 qPCR	PCV-2 IgG ELISA prior to vaccination
Result	Sampling time-point	S/P ratio
Result	Sampling time-point	X̅ ± SD	CV (%)
Positive	Only at 3–4 woa	0.549 ± 0.203 ^ab	37.0
	Only at 6 woa	0.622 ± 0.316 ^a	50.2
	Only at 9 woa	0.631 ± 0.303 ^a	48.7
	At 6 and 9 woa	0.361 ± 0.187 ^b	51.8
Negative	At 3–4, at 6 and at 9 woa	0.587 ± 0.286 ^a	48.9
Total		0.576 ± 0.259	47.3%

Different superscript indicates statistically significant differences between groups (p < 0.05)
CV: Coefficient of variation; ELISA: Enzyme-Linked ImmunoSorbent Assay; PCV-2: porcine circovirus 2; woa: weeks of age; SD: Standard deviation

ISSN: 2055-5660