A group of Treg-signature genes (Areg, Arhpag20, Bub1b, Ccl12, Ccr5, Il1r1, Mki67 (Ki67) Ncf1, Nrp2, Tnfrsf9, Tcf19, Uhrf1, and Wnt3) were expressed at higher levels in IFNARfl/fl x Foxp3YFP-Cre mice than WT controls on day 5 Armstrong infection. Here, TNFRSF9 is linked to infection.