Following infection of fgl2+/+ mice with 2×106 PFU LCMV WE, plasma levels of FGL2 increased from basal level of 0.8±0.2 ng/ml reaching a peak of 7.8±0.5 ng/ml on day 8 pi and remained elevated at all time points studied (up to day 50) when compared to uninfected (naive) mice (Figure 1). Here, FGL2 is linked to infection.