Your patient is a 24-year-old male Chinese citizen on vacation in the United States. He is in moderate distress, complaining of difficulty breathing and gives a four-day history of runny nose, sore throat, fever, chills, and general malaise with a productive cough. His sputum production was significantly worse when he woke this morning, and he developed difficulty breathing this afternoon. HR = 134, BP = 132/84, RR = 26, SaO2 = 90%. This presentation is most consistent with:

A) pneumonia.
B) tuberculosis.
C) SARS.
D) hantavirus pulmonary syndrome.

Ans: C) SARS.