PMC10194911_01
Timing of key events for the five household contacts with positive PCR or culture for B. pertussis on nasopharyngeal swabs.. Contacts a and d were asymptomatic at all study interviews in which they participated. NP, nasopharyngeal; PCR, polymerase chain reaction; PEP, post-exposure prophylaxis.
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Of the 168 household contacts who provided at least one NP specimen, one (0.6%; Fig 3, contact a) was culture-positive for B. pertussis and three (1.8%; Fig 3, contacts b-d) were PCR-positive at either the first or second study interview. A fifth household contact (Fig 3, contact 3) was indeterminate by PCR at both the first and second study interviews.