Review Question - QID 106422

Two weeks after returning from a two month spelunking trip in Tennessee to observe the brown bat's living habitat, a 30-year-old female presents with a two-week history of fever, productive cough, weight loss, and dyspnea. A chest radiograph was performed showing very small miliary opacities (Figure A). A sputum sample was taken and stained with methenamine (Figure B) and a histopathological sample taken from one of the opacities in the chest radiograph (Figure C). Which of the following is the most likely causative agent of the patient's symptoms and clinical findings?