ART4 and infection: To address the impact of the OMM12 bacterial consortia on virus-specific T cells, we next adoptively transferred naïve CD45.1+ SMARTA T cells that harbor a transgenic TCR specific for the H2-I-Ab-restricted LCMV gp61-80 epitope (glycoprotein residues 61-80) into SPF, OMM12 and GF animals before infection with LCMV Cl-13 (Fig. 3A).