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Survival of S. sobrinus 6715 (squares), SL1 (circles), and S. mutans UA159 (triangles) during acid challenge. Cells were collected from a steady-state chemostat held at pH 7.0 (open symbols) or 5.0 (solid symbols) and subjected to acid killing at pH 2.85. Cell viability at each time point is expressed as the percentage of viable cells (CFU per milliliter of culture) at time zero.
