Fig. 2.

Joint action of bacteriostatic antibiotics and PYO^Sa. The concentrations of these antibiotics are 10 μg/mL. (A) The ratio of the change in density of S. aureus after 24 h of exposure to antibiotics (blue), antibiotics plus phage (purple, green, orange, refers to order of addition as explained in the text) or phage alone (red). Hash red, the density of S. aureus recovered was below the detection limit, ∼10² cells per mL. (B) The ratio of the change in the density of PYO^Sa after 24 h of confronting wild-type S. aureus in combination with antibiotics or alone.