Cerebrospinal fluid findings in infants with pertussis or parapertussis(1)).

Background: Pertussis has been increasing in frequency and can cause protean manifestation in infants, often resulting in extensive laboratory evaluation.

Methods: We examined the prevalence of cerebrospinal fluid (CSF) anomalies in infants with pertussis and parapertussis over a 5-year period.

Results: In total, 239 of 1489 children (16.