USMLE STEP 2 Question of the Day #9

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Correct Answer: C. Strep pneumoniae
Topic: Pulmonology/Infectious Disease
Explanation:
Option A) Haemophilus influenzae: This organism is a common cause of pneumonia, particularly in patients with COPD. However, it typically causes a more indolent course and does not commonly produce rust-colored sputum. Therefore, this option is less likely.
Option B) Mycoplasma pneumoniae: This organism is a common cause of atypical pneumonia, which usually presents with a more gradual onset, non-productive cough, and interstitial infiltrates on chest X-ray, rather than lobar consolidation. Thus, this option is less likely.
Option C) Streptococcus pneumoniae: This is the most common cause of community-acquired pneumonia and typically presents with a sudden onset of symptoms, including fever, chills, and productive cough with rust-colored sputum. The presence of lobar consolidation on chest X-ray is also characteristic. Therefore, this is the correct option.
Option D) Staphylococcus aureus: This organism can cause pneumonia, especially after a viral infection or in hospitalized patients, and it often presents with rapid progression, severe illness, and sometimes cavitary lesions. It is less commonly associated with rust-colored sputum and lobar consolidation in community-acquired cases. Thus, this option is less likely.
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What buzzy phrase in the question stem helps us make the diagnosis?