[Expert Solution]: A 26 y.o

A 26 y.o. male visited the emergency department with a c/o of a nonproductive cough, dyspnea, and fever X 2 days; pt. does not smoke and has otherwise been in good health. VS: T 1010 F, B/P 100/64, R 25, P 104. Tachypnea is accompanied by mild cyanosis, and inspiratory crackles are noted upon auscultation. WBC 31,000, Hct 37%, platelet count 109,000. CXR shows diffuse infiltrates at the bases of both lungs. An ABG taken while the patient was breathing room air showed a pH of 7.54, CO2 of 20, O2 74. A Sputum C & S was done. DX: Pneumonia of idiopathic etiology Plan: Erythromycin, 1 GM IV stat Admit to ICU Deliver O2 by non-rebreather mask and monitor for hypoxemia What is the patient’s chief complaint?