Which of the following statements regarding severe acute respiratory syndrome (SARS) is correct?
A. SARS is caused by a virus and usually starts with flulike symptoms that deteriorate to pneumonia and respiratory failure.
B. Most cases of SARS are caused by a bacterium that is spread from person to person via direct contact with infected blood.
C. SARS is caused by a virus that occurs naturally in the bird population, although it usually does not cause illness in humans.
D. Although SARS can cause pneumonia and other respiratory infections, it rarely causes death, even in immunocompromised patients.
Answer: A. SARS is caused by a virus and usually starts with flulike symptoms that deteriorate to pneumonia and respiratory failure.
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