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Table 2 Proportion of infants for whom a close contact source case was identified versus for whom a community contact source was inferred stratified by analysis type.

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

Analysis Infants included in analysis For whom a source case was identified For whom contact in community likely responsible
  n % n % 95%CI n % 95%CI
Complete Case 45 47.9 31 68.9 (55.4, 82.4) 14 31.1 (17.6, 44.6)
Primary Multiple Imputation 94 100.0 62 65.7 (55.7, 75.8) 32 34.2 (24.2, 44.3)
Specific Source Case Definition* 94 100.0 50 53.4 (42.3, 64.4) 44 46.6 (35.6, 57.6)
Sensitive Source Case Definition** 94 100.0 75 79.7 (69.8, 89.6) 19 20.3 (10.4, 30.2)
  1. *The specific source case definition analysis requires symptom onset in primary cases to occur 7–30 days prior to symptom onset in the index case
  2. **The sensitive source case definition allows asymptomatically infected persons to be primary cases in the absence of identifying a symptomatic primary case