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Five PRRSV strains were reacted with IgA-low, IgA-medium, IgA-high OF samples, and with medium only (no OF), respectively. The replication of PRRSV in macrophages from blood monocytes was measured by Real time RT-PCR for PRRSV ORF 7 and expressed in terms of PRRSV genome copies / ml. Panel A: experiment 1. Panel B: experiment 2 on macrophages from another pig. P< 0.05 for PRRSV strain in experiment 2.
