What are the three stages of whooping cough?
1. Catarrhal (1-2 weeks with sympto: similar to a viral upper respiratory infection [URI]; most contagious stage)
2. Paroxysmal (following 1-6 weeks with characteristic burst of cough with inspiratory "whoop")
3. Convalescent (2-3 weeks with decreased coughing attacks; not contagious)
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