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Observational Study
. 2016 Feb 10;34(7):968-73.
doi: 10.1016/j.vaccine.2015.12.046. Epub 2016 Jan 4.

Maternal Tdap vaccination: Coverage and acute safety outcomes in the vaccine safety datalink, 2007-2013

Elyse Olshen Kharbanda  1 , Gabriela Vazquez-Benitez  2 , Heather S Lipkind  3 , Nicola P Klein  4 , T Craig Cheetham  5 , Allison L Naleway  6 , Grace M Lee  7 , Simon Hambidge  8 , Michael L Jackson  9 , Saad B Omer  10 , Natalie McCarthy  11 , James D Nordin  2
Affiliations
Observational Study

Maternal Tdap vaccination: Coverage and acute safety outcomes in the vaccine safety datalink, 2007-2013

Elyse Olshen Kharbanda et al. Vaccine. .

Abstract

Introduction: Since October 2012, the combined tetanus toxoid, reduced diphtheria toxoid, acellular pertussis vaccine (Tdap) has been recommended in the United States during every pregnancy.

Methods: In this observational study from the Vaccine Safety Datalink, we describe receipt of Tdap during pregnancy among insured women with live births across seven health systems. Using a retrospective matched cohort, we evaluated risks for selected medically attended adverse events in pregnant women, occurring within 42 days of vaccination. Using a generalized estimating equation, we calculated adjusted incident rate ratios (AIRR).

Results: Our vaccine coverage cohort included 438,487 live births between January 1, 2007 and November 15, 2013. Across the coverage cohort, 14% received Tdap during pregnancy. By 2013, Tdap was administered during pregnancy in 41.7% of live births, primarily in the 3rd trimester. Our vaccine safety cohort included 53,885 vaccinated and 109,253 matched unvaccinated pregnant women. There was no increased risk for a composite outcome of medically attended acute adverse events within 3 days of vaccination. Similarly, across the safety cohort, over a 42 day window, incident neurologic events, thrombotic events, and new onset proteinuria did not differ by maternal receipt of Tdap. Among women receiving Tdap at 20 weeks gestation or later, as compared to their matched controls, there was no increased risk for gestational diabetes or cardiac events while venous thromboembolic events and thrombocytopenia were diagnosed within 42 days of vaccination at slightly decreased rates.

Conclusion: Tdap coverage during pregnancy increased from 2007 through 2013, but was still below 50%. No acute maternal safety signals were detected in this large cohort.

Keywords: Maternal vaccination; Tdap; Vaccine coverage; Vaccine safety.

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Conflict of interest statement

Conflict of interest statement: The other authors did not report any potential conflicts of interest.

Figures

Fig. 1
Fig. 1
Flow chart.
Fig. 2
Fig. 2
Receipt of Tdap during pregnancy by trimester, live births between 2007 and 2013.
See this image and copyright information in PMC

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