Resistance of viscous material-producing
strain OD1-16 against the phagocytic activity of murine polymorphonuclear leukocytes (PMNLs)
in vivo. P. intermedia OD1-16 cells were not internalized by PMNLs (A and B, arrows). In contrast, P. intermedia ATCC 25611 and Porphyromonas gingivalis ATCC 33277 cells were ingested and digested in phagolysosomes (C-F, open stars). The data are representative from one of two independent experiments. Bars = 3.3 μm (A, C, and E) and 1.2 μm (B, D, and F).