TNFRSF1A and infection: We next evaluated the effects of post-infection TNFR1 blockade on the cellular composition of the BALF at days one and five p.i. Mice in the RSV-TNFR1 group demonstrated a slight increase in total cell counts at day one p.i. with no major changes at day five p.i. (Figure 8A; Day 1: 9%).