Fig 7. Photomicrographs showing buccal epithelial cells in adhesion assays using crystal violet and safranin.

(A) P. gingivalis alone attached in a buccal cell (original magnification x100). (B)–B. lactis HN019 alone attached in a buccal cell (original magnification x100). (C)–Mixture of B. lactis HN019 with P. gingivalis attached in a buccal cell (original magnification x100). Red arrows indicate P. gingivalis (Gram-negative bacteria with shorter rods or coccobacilli morphology). Blue arrows indicate Bifidobacterium (Gram-positive bacteria with long bacilli morphology).