Fig. 1From: In vitro immune responses of porcine alveolar macrophages reflect host immune responses against porcine reproductive and respiratory syndrome virusesPRRSV replication in PAMs and pigs. a Multi-step growth curve of PRRSVs in PAMs (n = 6) at 6, 12, 24, 36 and 48 hpi, as determined by titration using MARC-145 cells. b Viral loads in pig sera (n = 5) at 0, 3, 7, 14, 21 and 28 dpc, as determined by a quantitative real-time PCR for PRRSV. The bars represent the means, and the error bars represent the standard errors of the mean (SEM). Bars showing different letters represent values that differ significantly from each other (p < 0.05)Back to article page