TNF-α expression increased significantly in WT as well as LTβR−/− animals by day 10 p.i. and did not differ significantly between the two genotypes, although amounts in LTβR−/− mice seemed to rise more steeply later in infection (day 7 versus day 10 p.i. for WT and LTβR−/− mice, respectively). This evidence concerns the gene LTBR and infection.