FOXP3 and infection: While Srivastava et al (2014) reported a marked decrease in WT Foxp3+ Tregs on day 7 post infection in mixed bone marrow chimeras, we did not observe a decrease in Tregs on day 5 and the reduction in Treg frequencies and absolute numbers on day 7 was seen in both IFNARfl/fl and IFNARfl/fl x Foxp3YFP-Cre mice (S1B Fig).