YBX1 and infection: Upon infection with ML23ΔdbpBA producing DbpAPBr, DbpAN40-D10/E9, or DbpAVS461, we found that at 21 days post-infection, each of the DbpA variants tested was capable of fully replacing the colonization function of the endogenous (strain B31) DbpA and DbpB in the inoculation site, bladder, knee, and tibiotarsus (Table S1).