Which of the following organisms that cause pneumonia is most likely to result in a positive blood culture?
a. Chlamydia pneumoniae
b. Haemophilus influenzae
c. Mycoplasma pneumoniae
d. Pneumocystis jiroveci
ANS: B
Blood cultures should be obtained in hospitalized patients with community-acquired pneumonia and may be helpful in establishing the diagnosis in patients with typical bacterial pathogens. Blood cultures are positive in approximately 30% of patients with pneumococcal pneumonia and in up to 70% of those with H. influenzae pneumonia.
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