The role of adults in household outbreaks of pertussis
Received 24 April 2008; received in revised form 2 October 2008; accepted 31 March 2009. published online 26 June 2009.
Summary
Objectives
This study describes the role of adults in 57 household outbreaks of pertussis.
Methods
Parents/guardians of children with suspected pertussis seen at a university hospital were interviewed. Once a case of pertussis was confirmed, all household members were enrolled in the study. The US Centers for Disease Control and Prevention (CDC) definitions for pertussis were used .
Results
Among 349 household members, 150 were adults and one in five had pertussis during the household outbreaks. Of the adult cases, 70.6% were aged 19–39 years. The secondary attack rate in adults was 12.6%. Adults were the primary case in a 21.1% of households, resulting in 43% of all secondary cases. Most adult cases had typical symptoms of pertussis, but none had been diagnosed before the investigation.
Conclusions
Adults, particularly those aged between 19 and 39 years, play an important role in pertussis transmission in households. Pertussis vaccination in adolescents/young adults may decrease the dissemination of pertussis in households.
Corresponding Editor: William Cameron, Ottawa, Canada
ABSTRACT