In cystic fibrosis, which organism is most notorious for forming biofilms in the airways?

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In cystic fibrosis airways, bacteria that form biofilms are especially problematic because the biofilm lifestyle protects them from both the immune system and many antibiotics, leading to persistent infection. The organism most notorious for this in CF is Pseudomonas aeruginosa, particularly its mucoid variant that overproduces alginate. This thick, protective exopolysaccharide matrix allows P. aeruginosa to adhere to airway surfaces, grow as structured microcolonies, and resist antibiotic penetration and neutrophil killing. The CF lung environment—thick, viscous mucus, impaired mucociliary clearance, and fluctuating oxygen levels—favors biofilm development and chronic colonization, which drives gradual lung function decline. While other bacteria like Burkholderia cepacia, Klebsiella, and Staphylococcus can form biofilms, none are as characteristically associated with biofilm-driven persistence in CF airways as Pseudomonas aeruginosa.