MS-2458

A 50-year-old man comes to the physician complaining of non-productive cough and difficulty breathing during physical activity. During the examination, he has a fever and low oxygen saturation at rest. He has scattered crackles in his lungs, but no signs of focal consolidation. He has also experienced some weight loss. When questioned, he informs the doctor that he had unprotected sexual intercourse with multiple partners while on vacation in Thailand six months ago. What is the probable organism responsible for his symptoms?