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Comparison of esp-positive E. faecalis isolates (isolates D3 through D38) and esp-negative E. faecalis isolates (isolates D36 through D35) (x axis) from pigs for the presence (gray) or the absence (black) of PAI genes (y axis) (4). MMH594 and OG1RF were included as controls for PAI-positive and PAI-negative strains, respectively.
