A 40-year-old man with a history of substance abuse and HIV infection is seen in the ER with complaints of fever, weight loss, production of foulsmelling sputum, and shoness of breath for 2 wk. On physical exam he is tachypneic and has clubbing of his digits. Lung exam reveals diffuse rhonchi and an area of egophony with whispering pectoriloquy in the right chest posteriorly. ABGs reveal PaO2 of 59 mm Hg on room air. CXR is shown.What is the most likely diagnosis?