Which organisms are often identified in sputum cultures from patients with cystic fibrosis?

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Multiple Choice

Which organisms are often identified in sputum cultures from patients with cystic fibrosis?

In cystic fibrosis, the airways are chronically infected with bacteria that thrive in thick, sticky mucus. The organisms most commonly seen in sputum are Staphylococcus aureus and Haemophilus influenzae, especially earlier in life, with Pseudomonas aeruginosa becoming the dominant and most troublesome pathogen as the disease progresses. This trio—Staph aureus, Haemophilus influenzae, and Pseudomonas aeruginosa—reflects the typical pattern of initial colonization followed by persistent, biofilm-forming infection that is hard to treat in CF lungs. Staphylococcus aureus is a frequent early colonizer in children with CF. Haemophilus influenzae also appears commonly in the early stages. Pseudomonas aeruginosa, once established, tends to persist and often shifts to mucoid strains that produce a protective biofilm, making infections chronic and more resistant to antibiotics. The other organisms listed are not characteristic of CF sputum cultures. Streptococcus pneumoniae is a common cause of general pneumonia but does not define CF infections. Mycobacterium tuberculosis is not a typical CF pathogen. Candida albicans can be present in the airway but is not the hallmark pathogen driving CF sputum culture results.

In cystic fibrosis, the airways are chronically infected with bacteria that thrive in thick, sticky mucus. The organisms most commonly seen in sputum are Staphylococcus aureus and Haemophilus influenzae, especially earlier in life, with Pseudomonas aeruginosa becoming the dominant and most troublesome pathogen as the disease progresses. This trio—Staph aureus, Haemophilus influenzae, and Pseudomonas aeruginosa—reflects the typical pattern of initial colonization followed by persistent, biofilm-forming infection that is hard to treat in CF lungs.

Staphylococcus aureus is a frequent early colonizer in children with CF. Haemophilus influenzae also appears commonly in the early stages. Pseudomonas aeruginosa, once established, tends to persist and often shifts to mucoid strains that produce a protective biofilm, making infections chronic and more resistant to antibiotics.

The other organisms listed are not characteristic of CF sputum cultures. Streptococcus pneumoniae is a common cause of general pneumonia but does not define CF infections. Mycobacterium tuberculosis is not a typical CF pathogen. Candida albicans can be present in the airway but is not the hallmark pathogen driving CF sputum culture results.

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