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Table 1 Distribution of all identified close contacts to infant index cases, stratified by enrollment status, information on outcome (case) status, presence of symptoms, and household contact type.

From: Estimating the role of casual contact from the community in transmission of Bordetella pertussis to young infants

  Adult Household Child Household Non-household Total
  n % n % n % n %
Enrolled, known outcome (case) status 199 84.3 96 63.6 58 79.5 353 76.7
Enrolled, missing outcome status 7 3.0 31 20.5 13 17.8 51 11.1
   Symptomatic 1 0.4 14 9.3 6 8.2 21 4.6
   Asymptomatic* 6 2.6 17 11.2 7 9.6 30 6.5
Not enrolled 30 12.7 24 15.9 2 2.7 56 12.2
   Symptomatic 11 4.7 12 7.9 2 2.7 25 5.4
   Asymptomatic 19 8.1 12 7.9 0 0.0 31 6.7
Identified contacts 236 100.0 151 100.0 73 100.0 460 100.0
  1. *Multiple imputation was not used to impute source case status among asymptomatic persons in the main analysis (and the specific case definition analysis), because they are, by definition, not a source case in these analysis.