Murine Leishmaniasis models have been pivotal in demonstrating Tregs at the site of (parasitic) infection: antigen-specific CD4+CD25+ Tregs were present at the site of chronic Leishmania major infection (63) and retention at the infection site was dependent on expression of CD103 by CD4+CD25+ Tregs (64). Here, IL2RA is linked to leishmaniasis.