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. 2017 Mar 14;64(8):1129–1132. doi: 10.1093/cid/cix046

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© The Author 2017. Published by Oxford University Press for the Infectious Diseases Society of America.

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reproduction and distribution of the work, in any medium, provided the original work is not altered or transformed in any way, and that the work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 1. — Anti–pertussis toxin (PT) and anti–filamentous hemagglutinin (FHA) cord blood antibody concentrations by trimester of maternal immunization and gestational age at birth. Individual birth anti-PT and anti-FHA antibody concentrations after maternal tetanus-diphtheria-acellular pertussis immunization during the second trimester (gestational week [GW] 13 0/7–25 6/7) or third trimester (after GW 25 6/7) for all preterm neonates (left) or divided into early (GW 30 0/7–33 6/7, middle) and late (GW 34 0/7–36 6/7, right) preterm neonates; each point corresponds to 1 patient. Geometric mean concentrations are indicated with a horizontal line for each group. Seropositivity is defined as anti-PT ≥ 5 EU/mL.