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Measurement of virulence factors. Measurement of virulence factors of P. aeruginosa in the presence of QSI supernatant (1%, 5%), aqueous extract (5%), organic extract (0.5%), furanone (10 µM), methanol (0.5%) and QSI culture. (a) Siderophore production and (b) elastase activity. Asterisks indicate a statistically significant difference (*p < 0.05, **p < 0.01) between experimental groups and control (P. aeruginosa culture).
