A 72-year-old man presents to primary care for a sick visit, with the chief complaint of a one day history of fever, productive cough with yellow sputum and increasing shortness of breath. His vital signs are as follows, temp 99.8 °F (37.6 °C) , BP 140/85, heart rate 98 beats per minute, and respiratory rate 22 at rest period O2 saturation is 94% on room air. He has a history hypertension and type 2 diabetes, at guideline-based goals. He is a former smoker, quitting about 35 years ago with ap...