Fig. 2

Infection MG-63 cells by tested E. faecalis cps2 oral isolates. The binding capacity of encapsulated and unencapsulated strains was comparable after 3 h, but viable inside the cells at least 12 h post infection as assessed by CFU. *p < 0.05. The right panel shows the cells that was treated with each E. faecalis strain at MOI of 1000 for 3 and 12 h and visualized by using light microscopic images at ×400 magnification. Bar 20 µm. a Control uninfected cells. b Adhesion phase (3 h). c and d are cells infected with encapsulated and unencapsulated E. faecalis cps2, respectively. The arrows show adhered and internalized bacteria