Figure 4.

Recovery of Brucella cfu from spleens one week after BALB/c mice were inoculated by gavage with wild type strain 1330 or strain 1330Δure1KΔure2C with or without urea supplementation. P value for the difference among mean values was <0.01. The mean values that share the same symbol do not differ from one another significantly; and the mean values designated by different symbols differ from one another significantly.