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PCV2 DNA copies/g loads in SILN tissues collected on the day of necropsy. PCV2 DNA was extracted from 50 μg of homogenized SILN tissues and subjected to real-time PCR amplification. The PCV2 genomic copy loads are represented as a log10 value per 1 g of SILN tissue (y axis) (*P < 0.05; **P < 0.01)
