Perinatal survival and health after maternal influenza A(H1N1)pdm09 vaccination: A cohort study of pregnancies stratified by trimester of vaccination

The risk of adverse pregnancy outcomes was not associated with the exposure to the AS03 adjuvanted pandemic influenza vaccine. This study adds reassuring evidence on the safety of AS03 adjuvanted influenza vaccines when given in the first trimester and supports the recommendation of influenza vaccination to all pregnant women through all stages of pregnancy.