TABLE 2

Carriage rates for nongroupable isolates at any visit

MethodNo. of subjects with positive non-NmB meningococcal carriage at any visit/no. ofsubjects with ≥1 culture performed at any visit (% [95% CIa]) by cohort:
Ninth-grade studentsUniversity students
Seroagglutination36/533 (6.8 [4.8, 9.2])79/360 (21.9 [17.8, 26.6])
Isolate PCR21/533 (3.9 [2.5, 6.0])44/360 (12.2 [9.0, 16.1])
P valueb0.001<0.001
  • a 95% Clopper-Pearson 2-sided CI.

  • b McNemar test using exact method is used to compare the prevalence rate between PCR and culture/seroagglutination at each visit.