Which of the following is not true of whooping cough?
A. Secondary infections can occur during the convalescent phase.
B. It is caused by a small, aerobic, gram-negative rod.
C. Incubation period is 3-21 days.
D. An uncontrollable cough occurs during the paroxysmal stage.
E. Cold-like symptoms are common for the paroxysmal stage.
Answer: E
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