In the case of mucosal HSV-2 infection, the level of IFN-λ in vaginal washes from Oasl1−/−→WT mice did not decrease and was maintained until late time points post-infection; however, the amount of IFN-λ at early time points in Oasl1−/−→WT mice did not differ from that of Oasl1+/−→WT mice (Fig. 2d). This evidence concerns the gene OASL and infection.