A cough illness lasting at least 2 weeks with one of the following: paroxysms of coughing, inspiratory "whoop," or post-tussive vomiting -- and without other apparent cause (as reported by a health professional)
Isolation of Bordetella pertussis from clinical specimen
Meets the clinical case definition, is not laboratory confirmed, and is not epidemiologically linked to a laboratory-confirmed case
A clinically compatible case that is laboratory confirmed or epidemiologically linked to a laboratory-confirmed case
The clinical case definition above is appropriate for endemic or sporadic cases. In outbreak settings, a case may be defined as a cough illness lasting at least 2 weeks (as reported by a health professional). Because direct fluorescent antibody testing of nasopharyngeal secretions has been shown in some studies to have low sensitivity and variable specificity, it should not be relied on as a criterion for laboratory confirmation.1,2 Both probable and confirmed cases should be reported to the National Notifiable Diseases Surveillance System (NNDSS).