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  • Uptake and safety of hepatitis B vaccination during pregnancy

Uptake and safety of hepatitis B vaccination during pregnancy

A Vaccine Safety Datalink study

Groom, H., Irving, S., Koppolu, P., Smith, N., Vazquez-Benitez, G., Kharbanda, E., Daley, M., Donahue, J., Getahun, D., Jackson, L., Kawai, A. T., Klein, N., McCarthy, N., Nordin, J., Sukumaran, L., & Naleway, A. (2018). Uptake and safety of hepatitis B vaccination during pregnancy: A Vaccine Safety Datalink study. Vaccine, 36(41), 6111-6116. https://doi.org/10.1016/j.vaccine.2018.08.074

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Abstract

INTRODUCTION:
Hepatitis B virus (HBV) infection acquired during pregnancy can pose a risk to the infant at birth that can lead to significant and lifelong morbidity. Hepatitis B vaccine (HepB) is recommended for anyone at increased risk for contracting HBV infection, including pregnant women. Limited data are available on the safety of HepB administration during pregnancy.

OBJECTIVES:
To assess the frequency of maternal HepB receipt among pregnant women and evaluate the potential association between maternal vaccination and pre-specified maternal and infant safety outcomes.

METHODS:
We examined a retrospective cohort of pregnancies in the Vaccine Safety Datalink (VSD) resulting in live birth outcomes from 2004 through 2015. Eligible pregnancies in women aged 12-55 years who were continuously enrolled from 6 months pre-pregnancy to 6 weeks postpartum in VSD integrated health systems were included. We compared pregnancies with HepB exposure to those with other vaccine exposures, and to those with no vaccine exposures. High-risk conditions for contracting HBV infection were identified up to one-year prior to or during the pregnancy using ICD-9 codes. Maternal and fetal adverse events were also evaluated according to maternal HepB exposure status.

RESULTS:
Among over 650,000 pregnancies in the study period, HepB was administered at a rate of 2.1 per 1000 pregnancies (n = 1399), commonly within the first 5 weeks of pregnancy. Less than 3% of the HepB-exposed group had a high-risk ICD-9 code indicating need for HepB; this was similar to the rate among HepB unvaccinated groups. There were no significant associations between HepB exposure during pregnancy and gestational hypertension, gestational diabetes, pre-eclampsia/eclampsia, cesarean delivery, pre-term delivery, low birthweight or small for gestational age infants.

CONCLUSIONS:
Most women who received maternal HepB did not have high-risk indications for vaccination. No increased risk for the adverse events that were examined were observed among women who received maternal HepB or their offspring.

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