Table 1: Stages and Clinical Features of Pertussis - LabCE.com, Laboratory Continuing Education

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The page below is a sample from the LabCE course Respiratory Case Study: Possible Pertussis Infection. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Table 1: Stages and Clinical Features of Pertussis

Stage	Length	Clinical Features
Catarrhal	Usually 7-10 days; range of 4-21 days	Inflammation of mucous membranes in the nose Low-grade fever Mild, occasional cough (which becomes progressively worse)
Paroxysmal	Usually 1-6 weeks; may persist up to 10 weeks	Paroxysms of numerous, rapid coughs due to difficulty expelling thick mucus from the tracheobronchial tree Paroxysmal attacks frequently occur at night Average of 15 attacks/24-hour period Increase in frequency of attacks during the first 1-2 weeks, remain at the same frequency 2-3 weeks, and then gradually decrease Long inspiratory effort accompanied by a high-pitch "whoop" at the end of the paroxysms Cyanosis Vomiting and exhaustion
Convalescent	Usually 7-10 days; range of 4-21 days	Gradual recovery Less persistent paroxysmal coughs that disappear in 2-3 weeks Paroxysms often recur with subsequent respiratory infections for many months after the onset of pertussis

4. Centers for Disease Control and Prevention. Adapted from the table, Clinical features of pertussis. Available at: http://www.cdc.gov/pertussis/clinical/features.html.