PLE-3623

An alcoholic presents complaining of chest pain, fever, shaking chills, cough, and myalgia. He was very cold 2 nights ago and says he felt poorly ever since. His cough is producing rust-colored, odorless, mucoid sputum. His temperature on admission is 40°C. His WBC count is 16,000 cells/mm3 with PMN predominance and an overall left shift. An alpha-hemolytic, lancet-shaped, gram-positive diplococcus is isolated on blood agar. What is the most likely causative agent?