A 5-year-old boy is brought to the emergency room with a fever of 103degF (38.7degC), chest pain, and productive cough. The patient has a history of recurrent pulmonary disease and respiratory distress. What microorganism recovered from the lungs of this child is virtually diagnostic of cystic fibrosis?
Klebsiella sp. Legionnella sp. Pneumocystis sp. Pseudomonas sp.