To the Editor We read with interest the article by Hviid et al1 showing influenza A (H1N1) pdm09 vaccine to be safe for use during pregnancy. There has been a reduced risk for influenza and influenza-like illness observed among the infants of vaccinated mothers,2 thought to be owing to transplacental transfer of maternal antibodies.3 Do the data allow comparison of influenza A infections in the offspring between the mothers who have been vaccinated and unvaccinated? This would be of interest because influenza infections are associated with excess morbidity including excess hospitalizations.4
Sandy K, Gandham S, Nanan R. Influenza A Infections in Infants of Vaccinated and Unvaccinated Mothers. JAMA Pediatr. 2017;171(10):1014–1015. doi:10.1001/jamapediatrics.2017.2391
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