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Evaluating the safety of vaccination during pregnancy is complicated by the general avoidance of routine immunizations other than those that are indicated (e.g., influenza vaccine); hence, reliable data are sparse regarding outcomes in women who inadvertently received the human papillomavirus (HPV) vaccine before becoming aware they were pregnant. Investigators queried nationwide prospective medical records of pregnant Danish women from October 2006 to November 2013 to determine whether outcomes differed among women who received the quadrivalent HPV vaccine during pregnancy versus those who did not. About 500,000 singleton pregnancies were identified, including some 1700 exposed to the vaccine.
Analyses adjusted for potential confounders sho…