A 71-year-old woman has smoked a pack of cigarettes per day for 50 years. She has had increasing dyspnea for 12 years. Over the past 3 days she has become febrile, with a pro ductive cough, and severe dyspnea Auscultation of her chest reveals rales and expiratory wheezes. Laboratory studies show peripheral blood neutrophilia. Which of the following organisms is most likely to be cultured from her sputum