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Porcine PBMCs were cultured with medium alone, APS, PRRSV, PRRSV plus APS, CSFV, or CSFV plus APS. Cell proliferation was assessed after 24, 48 and 72 h of cultivation. The results are presented as a percentage relative to the OD570 values of nonstimulated PBMC (100%) at the same day. Data are presented as means ± SEM of three independent experiments. Within the same time: *, P<0.05; **, P<0.01.
