Vaccination is considered to be the most practical and effective preventative measure against influenza. It is highly recommended for population subgroups most at risk of developing complications, including pregnant women. However, seasonal influenza vaccine uptake remains suboptimal among pregnant women, even in jurisdictions with universal vaccination. We summarized the evidence on the determinants of seasonal influenza vaccine uptake during pregnancy to better understand factors that influence vaccine uptake among pregnant women.
We systematically searched MEDLINE, Embase, and CINAHL from January 2000 to February 2020 for publications in English reporting on sociodemographic and/or health-related determinants of seasonal influenza vaccine uptake during pregnancy. Two reviewers independently included studies. One reviewer extracted data and assessed study quality, and another reviewer checked extracted data and study quality assessments for errors. Disagreements were resolved through consensus, or a third reviewer. We meta-analyzed using the inverse variance, random-effects method, and reported the odds ratios (OR) and 95% confidence intervals (CI).
From 1,663 retrieved citations, we included 36 studies. Older age (OR: 1.13, CI: 1.07-1.20 [20 studies]), being nulliparous (1.26, 1.15-1.38 [13 studies]), married (1.11, 1.07-1.15 [8 studies]), employed (1.13, 1.02-1.24 [4 studies]), a non-smoker (1.25, 1.04-1.51 [8 studies]), and having prenatal care (3.36, 2.25-5.02 [3 studies]), a chronic condition (1.30, 1.17-1.44 [6 studies]), been previously vaccinated (4.88, 3.14-7.57 [9 studies]), and living in a rural area (1.09, 1.05-1.14 [9 studies]) were associated with increased seasonal influenza vaccine uptake. Compared with being Black, being White was also associated with increased seasonal influenza vaccine uptake (1.30, 1.20-1.41 [11 studies]).
The evidence suggests that several sociodemographic and health-related factors may determine seasonal influenza vaccination in pregnancy, and that parity, history of influenza vaccination, prenatal care and comorbidity status may be influential.

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