A 10-year-old girl with cystic fibrosis presents with 2 days of high fever and a cough productive of purulent green sputum. On chest x-ray (CXR) there is a left upper lobe (LUL) infiltrate. What is the most likely pathogen contributing to her symptoms? Appropriate treatment?
Answer: Pseudomonas aeruginosa. Treatment with an aminoglycoside and antipseudomonal penicillin (eg, tobramycin and piperacillin) or an antipseudomonal cephalosporin
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