Examination of Children with Infection of Upper Respiratory Tract for Bacillus Pertussis by Cough Droplet Method

The inability to isolate the pertussis bacillus by the cough droplet method from patients with infections of the upper respiratory tract other than whooping cough, the negative results obtained by other investigators from cultures of material from the nasopharynx and larynx of persons not in contact with whooping cough and the negative pulmonary and laryngeal cultures made post mortem on children who died from various other causes add to the view that the pertussis bacillus is found only in persons who have or have had whooping cough and in those who have been in contact with the disease.