Figure 2From: Listeria monocytogenes virulence factor Listeriolysin O favors bacterial growth in co-culture with the ciliate Tetrahymena pyriformis, causes protozoan encystment and promotes bacterial survival inside cystsChanges in the T. pyriformis population in the presence or absence of L. monocytogenes. Trophozoite concentrations are shown by polylines; cyst concentrations are shown by bars. Protozoa were grown alone (white) or in co-culture with the L. monocytogenes strain EGDe (solid). The mean values ± SD from three experiments made in triplicate are shown.Back to article page