464. A 30yo female attends OPD with a fever and dry cough. She says that she had headache, myalgia and joint pain like one week ago. Exam: pulse=100bpm, temp=37.5C. CXR: bilateral patchy
consolidation. What is the single most likely causative organism?
a. Pneumococcal pneumonia
b. Legionella
c. Mycoplasma
d. Klebsiella
e. Chlamydia pneumonia
answer:C
Legionella and Mycoplasma have a flu like episode that is followed by a dry cough, but mycoplasma has arthalgia while legionella doesn't , also on X-ray mycoplasma is either patchy or reticulonodular, whilst legionella is bilateral basal.
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