What pathogenic bacteria is commonly found in the lungs of older children and adults suffering from cystic fibrosis?

The correct answer is Pseudomonas aeruginosa, as this bacterium is notably associated with lung infections in individuals with cystic fibrosis (CF). CF is a genetic disorder that significantly affects the respiratory system, leading to thick and sticky mucus production that traps pathogens, including bacteria.

Pseudomonas aeruginosa is particularly adept at colonizing the lungs of patients with CF due to its ability to form biofilms, resist phagocytosis, and exhibit antibiotic resistance. These characteristics allow it to thrive in the altered lung environment of individuals with CF, contributing to chronic lung infections and exacerbating respiratory complications.

Other pathogens may be present in CF patients, but Pseudomonas aeruginosa is the most common and concerning due to the severity of infections it can cause and its impact on the overall health of those affected. Identifying and treating infections caused by this organism is crucial in managing the complications associated with cystic fibrosis.