Comparison of the Nasopharyngeal Swab and the Cough Plate in the Diagnosis of Whooping Cough and Hemophilus pertussis Carriers

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Abstract
342 comparative tests with nasopharyngeal swab cultures and cough plates were made in 214 cases of whooping cough. In every week of the disease, and in each age group, the swab cultures yielded a higher % of positive results for H. pertussis than did the cough plates. Use of both procedures however was superior to that of the swab alone. 5 cases of para-pertussis were encountered during the study. Three carriers of H. pertussis were found among 12 familial contacts to pertussis. The nasopharyngeal swab technic can provide the public health officer with a simple means of detecting early cases, atypical cases, and carriers of H. pertussis.

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