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FIG. 4.

FIG. 4.

Laser confocal microscope images of day 5 and 6 postinfection CD11b+ cell fractions from the spleens of BALB/c mice infected with Y. pestis(pACGFP). (A to D) Extended views of macrophages containing a number of single (C and D) or replicating (A and B) intracellular bacteria isolated on day 5 (A and B) and day 6 (C and D) postinfection. (E) Single view from panel D, accompanied by horizontal and vertical Z-projections indicating the presence of a bacterium within the macrophage and not on its surface. Bars = 10 μm.