Fig. 1

Scheme of the study design, showing the number of farms included in the study in 2020 and in 2022, the different sampled ages, the number of bled pigs depending on the farm size, the laboratory techniques performed (IgG PCV-2 ELISA, qPCR for PCV-2 and RT-qPCR for PRRSV), and the number of samples analysed per each technique. PCV-2: porcine circovirus 2; PRRSV: porcine reproductive and respiratory syndrome virus; woa: weeks of age