Figure 3From: Comparative analysis of routes of immunization of a live porcine reproductive and respiratory syndrome virus (PRRSV) vaccine in a heterologous virus challenge study PRRSV neutralizing antibody (NA) titers in the plasma and BAL fluid of pigs. Viral NA titers in the plasma (A–C) and BAL fluid (D–F) against challenged PRRSV strain 1-4-4 (A, D), PRRS-MLV parent strain VR2332 (B, E) and a genetically variant Type 2 PRRSV strain MN184 (C, F) were determined by indirect immunofluorescence assay. The NA titer of a sample was expressed as the reciprocal of the highest dilution that inhibited >90% of the virus induced immunofluorescence activity. Each data point or bar in the graph represents the average NA titer from 4 or 5 pigs ± SEM.Back to article page