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Table 2 The impact and efficiency of alternative introduction strategies

From: Assessing the efficiency of catch-up campaigns for the introduction of pneumococcal conjugate vaccine: a modelling study based on data from PCV10 introduction in Kilifi, Kenya

Introduction of PCV via IPD averted after 10 years Doses administered Incremental NVN NVN
Cohort only 155 (121–193) 204,671 1321 (1058–1698) 1321 (1058–1698)
+ U1 catch-up 173 (134–216) 218,089 757 (618–973) 1263 (1012–1623)
+ U2 catch-up 189 (147–235) 224,952 412 (296–606) 1188 (958–1527)
+ U5 catch-up 220 (172–270) 241,546 543 (403–763) 1098 (894–1405)
  1. The number of vaccine doses needed to prevent a case of IPD (NVN) is used as a measure of efficiency. Incremental NVN refers to the additional number of doses needed to prevent one additional cases of IPD in respect to cohort introduction with the next smaller catch-up