TAT and infection: To determine if the Tat system also contributes to polymicrobial infection, CBA/J mice were transurethrally inoculated with 1 × 105 CFU of the following mixture: 5 × 104 CFU of a 1:1 mixture of the tatC mutant and wild-type P. stuartii and 5 × 104 CFU of wild-type P. mirabilis (Fig. 9D).