RPSA and infection: The results showed that RPSA+ PMNs had significantly lower secretion of pro-inflammatory cytokines (i.e., TNF-α and IL-6) than RPSA− PMNs, but there were no differences in the secretion of TNF-α and IL-6 by RPSA+ PMNs and RPSA− PMNs between the SS2 infection group and the non-infection group (Figures 5A–C).