CD8A and Yersinia pseudotuberculosis infectious disease: However, some aspects of the functionality of T-bet+ Tregs still remain unclear, as one report described the suppression of CD8+ T cells in a Listeria monocytogenes-driven model [17], whereas another recent study observed an increase in CD8+ tissue-resident memory T cells (TRM) mediated by T-bet+ Tregs, thereby eliciting the clearance of pathogens during Eimeria vermiformis and Yersinia pseudotuberculosis infections [19].