Patient History: A 44-year-old man presents with sudden onset of shaking chills, fever, and productive cough. He was in his usual state of good health until 1 week ago, when he developed mild nasal congestion and achiness. He otherwise felt well until last night, when he became fatigued and feverish, and he developed a cough associated with right-side pleuritic chest pain. His medical history is remarkable only for his 15-pack per year smoking habit. Physical Examination: His vital signs are normal except for a temperature of 102°F. His oxygen saturation on room air is 100%.

He is comfortable, except when he coughs. Overall, the physical examination is unremarkable except for bronchial breath sounds and end-inspiratory crackles in the right lower lung field. What is the probable diagnosis? *This patient case is from Docplexus Editorial Team for educative purpose only. Source: Case Files…