WBC elevated in infants (20-100) with large amount of lymphs (85%), adults and infants < 6 mo may be WNL
CXR with peribronchial thickening, atelectasis, and/or consolidation
Nasopharyngeal swab can identify it in 3-7 days; often neg in adults.
Cough for >2 weeks, post tussive emesis, feeling well otherwise, treat them empirically.  Especially if infant or pregnant people at home.
Pertussis
Airway obstruction
Diphtheria
Anaphylaxis
Influenza
Angioedema
Poliomyelitis
Aspirated foreign body