A 24-year-old man comes to the physician for a 5-day history of non-productive cough, sore throat, and fever. Temperature is 101 F. Crackles are heard over the right lower lobe. Chest x-ray shows patchy, lower right alveolar infiltrates with interstitial markings. Leukocyte count is 9,000/μL. Hemoglobin is 11 g/dL. Which of the following is the most likely explanation for these findings?
Cytomegalovirus
Haemophilus influenzae
Klebsiella pneumoniae
Legionella pneumoniae
Mycoplasma pneumoniae
Streptococcus pyogenes
