Figure 5: The production of virulence factors in the presence of L-NAC. Subinhibitory concentrations of both F-NAC & L-NAC were added to PA- 13572 and incubated for 24 h. The supernatants were tested for (A) chitinase, (B) elastase, (C) lipase, and (D) protease. P values were considered significant when compared to control *** P<0.001, **P<0.01. All experiments were repeated 3 times in triplicates.