a Inhibitory effect of P. tersa crude extract (900 μg/mL) on quorum sensing regulated processes: a production of pigments, in C. violaceum and P. aeruginosa PAO1, lysis of Staphylococcus aureus cell, degradation of Azocasein, production of chitinase and elastase. b Inhibition of virulent factors: exopolysaccharide (EPS), microbial adhesion to hydrocarbon (MATH), alginate, biofilm formation, swimming and swarming motility