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

Table 5 PCV-2 IgG ELISA mean S/P ratios obtained prior to vaccination (3–4 woa) in the 28 farms sampled in 2020 and 2022, grouping the farms in the four stablished scenarios considering PCV-2 detection in both studied years

Defined scenarios	PCV-2 IgG ELISA S/P ratio before vaccination (3–4 woa)
	2020		2022
	X̅ ± SD	CV (%)	X̅ ± SD	CV (%)
POS20-POS22	0.397 ± 0.197 ^a ^A	49.1	0.599 ± 0.372 ^a ^A	62.0
POS20-NEG22	0.549 ± 0.203 ^a ^AB	37.0	0.686 ± 0.263 ^a ^A	38.4
NEG20-POS22	0.628 ± 0.286 ^a ^B	45.5	0.476 ± 0.275 ^b ^A	57.9
NEG20-NEG22	0.639 ± 0.342 ^a ^B	53.4	0.531 ± 0.284 ^a ^A	53.6
Total	0.598 ± 0.315	56.6	0.530 ± 0.298	56.1

Different superscript lowercase letters indicate statistically significant differences between years for each scenario, and the uppercase ones indicate statistically significant differences between scenarios in each year (p < 0.05)s
CV: Coefficient of variation; ELISA: Enzyme-Linked ImmunoSorbent Assay; PCV-2: porcine circovirus 2; woa: weeks of age; SD: Standard Deviation

ISSN: 2055-5660