FIG. 4.

Recovery of bacteria from fecal pellets collected after inoculation of mice with an equal mixture of CL1509 (aroA) and RAK7 (shdA aroA). Data for days 1 to 6 were from 10 mice, and data for subsequent days were from 6 mice. (A) For each mouse, the output ratio (RAK7/CL1509) was determined daily. Data were converted logarithmically and are given as means ± standard errors (error bars). An asterisk below an error bar indicates that the RAK7/CL1509 output ratio was significantly different (P < 0.05) from that present in the inoculum. (B) Total numbers of CL1509 (open circles) and RAK7 (closed circles) recovered from fecal pellets of mice. The limit of detection (1.2 × 10⁻¹ CFU/mg of feces) is indicated by a broken line. Each circle represents data for one strain from one animal. Animals for which no CFU of either CL1509 or RAK7 were detectable are indicated below the broken line along the x axis.