FIG. 6.

Delayed RSV clearance in TLR4^null mice. The lungs of TLR4^null and TLR4^wt mice were harvested at days 3, 5, 7, and 11 p.i. with RSV (A) or influenza virus (FLU) (B). The asterisk indicates a significant difference (P < 0.01) between TLR4^null and TLR4^wt mice. The results are expressed as mean log₁₀ PFU/g ± the standard error of the mean from four separate experiments. In each experiment, three to five mice per group at each time point were analyzed.