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Although the incidence of Haemophilus influenzae type b (Hib) infection has dropped dramatically since the universal childhood Hib vaccine immunization program was implemented, invasive infections caused by nontypeable H. influenzae strains still occur. Several recent studies have suggested increased risk for serious infection with these strains in pregnant women and neonates. To better understand the association between invasive H. influenzae disease and pregnancy, researchers conducted enhanced surveillance for confirmed invasive H. influenzae infections among women of childbearing age in England and Wales between 2009 and 2012.
A total of 2568 cases of invasive H. influenzae disease were identified during the study period, with 8.7% of th…