Total nucleic acids were extracted from serum samples using a MagNA Pure LC total nucleic acid isolation kit (Roche Diagnostics GmbH, Mannheim, Germany) operated on a MagNA Pure LC 2.0 automatic nucleic acid extraction instrument (Roche Diagnostics GmbH, Mannheim, Germany), according to the manufacturer’s instructions. To quantify the PCV2 load in serum samples, quantitative real-time PCR assay was tested and performed with a LightCycler® 96 system (Roche Applied Science, Basel, Switzerland) as described Tsai et al. [18 (link)].
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