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Before 2012, few studies had addressed pregnancy outcomes following maternal influenza vaccination; however, the number of publications on this topic has increased recently.

To review comparative studies evaluating fetal death or preterm birth associated with influenza vaccination during pregnancy.

We searched bibliographic databases from inception to April 2014.

Experimental or observational studies assessing the relationship between influenza vaccination during pregnancy and fetal death or preterm birth.

Two reviewers independently abstracted data from studies meeting the inclusion criteria.

We included one randomised clinical trial and 26 observational studies. Meta‐analyses were not considered appropriate because of high clinical and statistical heterogeneity. Three studies of fetal death at any …