GLTP and infection: In the kidneys (Figure 6b), no bacteria were detected in the gltS mutant-infected mice on the first day post infection, whereas mice infected with the UTI89 strain still had 105 CFU bacteria; on the third day post infection, the bacterial load in mice infected with the gltP and gltI mutants decreased to a level below the detection limit, whereas there were 103 CFU bacteria in mice infected with the parent strain UTI89.