Which organism is a common cause of pneumonia in cystic fibrosis patients?

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In cystic fibrosis, thick, dehydrated mucus in the airways impairs mucociliary clearance, creating a niche where certain bacteria can persistently colonize. Pseudomonas aeruginosa, especially the mucoid form, readily grows in this mucus, forms biofilms, and resists many defenses and antibiotics. Because of this, it becomes the most common cause of pneumonia and chronic lung infection in CF patients, contributing to ongoing inflammation and lung function decline. Other organisms like Staphylococcus aureus, Haemophilus influenzae, and Streptococcus pneumoniae can cause pneumonia, especially earlier in life, but they do not establish the persistent, high-burden infections typical of Pseudomonas in CF. The appearance of Pseudomonas is a hallmark of CF lung disease and shapes management with targeted antibiotic therapy, including inhaled options.