Influenza vaccination during pregnancy: a systematic review of fetal death, spontaneous abortion, and congenital malformation safety outcomes

Vaccine
M McMillanH Marshall

Abstract

Pregnant women are considered the most important risk group for influenza vaccination. Despite this, the potential risk of harm from the vaccine on the fetus is a key factor in low uptake of the vaccine. This systematic review aimed to synthesize the best available evidence on the safety of influenza vaccination during pregnancy on fetal development. A search of the literature was undertaken from the inception of each database up to March 2014. Both observational and clinical trials were considered. Fetal outcomes were present in 19 observational studies, and 14 of those were primarily investigating the monovalent influenza A (H1N1) 2009 vaccine. There was significant methodological and clinical heterogeneity of the included studies and a narrative summary and tabling of results was performed. Fetal death outcomes for women in later pregnancy ranged from OR 0.34 to 2.95 with 95% confidence intervals crossing or below the null value. Spontaneous abortion less than 24 weeks ranged from HR 0.45 to OR 1.23, with 95% confidence intervals crossing or below the null value. Congenital malformations for women vaccinated during their first trimester ranged from OR 0.67 to 2.18 and imprecise confidence intervals crossed the null value. In...Continue Reading

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