SMOX and cystic fibrosis: We also used two recently isolated clinical CF strains of P. aeruginosa, PASS1 and PASS2, together with PAO1, a commonly used reference strain, and a clinical S. aurantiacum isolate (WM 06.482) with a high established virulence and a less-virulent type strain WM 08.202 to add to the clinical relevance of the findings.