ESAT-6 TCRtg (C7) mice were provided by E. Pamer and have been described previously (9 (link)). OT-II mice were provided by M. Gerner (University of Washington). C57BL/6 and MHCII−/− mice were purchased from Jackson Laboratories (Bar Harbor, ME). All mice were housed in specific pathogen-free conditions at Seattle Children’s Research Institute (SCRI). Experiments were performed in compliance with the SCRI Animal Care and Use Committee. Both male and female mice between the ages of 8-12 weeks were used.