A Recently Retired Man Appears at His Doctorʹs Office Complaining

A recently retired man appears at his doctorʹs office complaining of difficulty breathing, body aches and fatigue. He is also running a high fever and has a dry cough. He reports having just returned from a trip to the Middle East where he visited several historical sites. Test results are negative for a rapid test for influenza A. No bacteria are visible in a microscopic exam of his sputum. Which of the following is a likely explanation?

A) inhalation anthrax
B) valley fever
C) pertussis
D) primary atypical pneumonia
E) coronavirus respiratory syndrome