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. 2008 Mar 26;46(5):1672–1677. doi: 10.1128/JCM.02187-07

TABLE 3.

Distribution of positive and negative cases with laboratory-confirmed pertussis for participants ≥7 years olda

Method of diagnosis (cutoff) No. of cases No. of noncases
Positive pertussis test
    ptxA-Pr PCR 13 3
    IS481 PCR 37 17
    Single serology (≥125 EU/ml) 53 9
    Paired serology (×4b) 13 12
Positive pertussis test using combination of single serology (≥125 EU/ml) with:
    Paired serology (×4) 66 12
    PtxA-Pr PCR 62 12
    IS481 PCR 73 23
a

Subjects were contacts of infant pertussis cases with complete laboratory data (n = 195). Complete data include symptoms, serology, and PCR (IS481 and ptx-Pr) at enrollment and symptoms and serology at follow-up visit 1 month later.

b

×4, fourfold change in titer.

cCase definition: laboratory-confirmed symptomatic contact. There were 82 cases and 113 noncases.

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