Figure 2. Phagocytosis (internalized particles per 200 cells) was quantified in serial samples after pre-inoculation with either PRRSV strains.

Aliquots (1 ml) of a suspension of 1×10⁶ porcine PMNs were incubated with coated beads for 40 min at 37 °C. Phagocytosis of IgG-opsonized beads by PMNs is decreased after inoculation by either PRRSV strains. Error bars represent standard error of the mean from five animals. *, p<0.05. **, p<0.01.