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Percentage decrease in caseinolytic zone of milk‐casein agar when incubated with each dressing and protease‐rich conditioned media of an ATCC type strain and 2 chronic wound‐isolated Pseudomonas aeruginosa. Milk‐casein agar plates were incubated (n = 3) for 0, 1, 3, 6 and 24 hours. I1: P. aeruginosa Wound strain 1 (low biofilm potential); I2: P. aeruginosa Wound strain 2 (high biofilm potential). ‘Polyphosphate’ refers to the foam dressing containing polyphosphate.
