A 28-year-old previously healthy man presents to the emergency department
with complaints of fever, nonproductive cough, and progressive fatigue for three
weeks. He has additionally noted a 15 pound weight loss over the past three months.
On examination, his temperature is 38.8 °C, pulse 124/min, respirations 28/min,
and blood pressure 110/78. He has scant thrush in the oropharynx, but his chest is
clear to auscultation and percussion and he has no other examination findings.
Laboratory testing showed WBC of 3.2K (with 83% polys, 6% bands, 5% lymphs,
3% eosinophils, 3% basophils); hematocrit of 31%; arterial blood gas (room air)
with pH 7.51; pO2 29 mm Hg; and pCO2 62 mm Hg. A CXR shows bilateral interstitial
infiltrates throughout all lung fields. Which of the following should therapy include?

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Can go for Pneumocystis carinii pneumonia....so best option is D...

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