%0 Journal Article %T Lower perinatal exposure to Proteobacteria is an independent predictor of early childhood wheezing %A Augusto A. Litonjua %A Benjamin A. Turturice %A David L. Perkins %A Diane R. Gold %A Emily Oken %A Patricia W. Finn %A Sheryl Rifas-Shiman %J Journal of Allergy and Clinical Immunology %D 2019 %R 10.1016/j.jaci.2018.06.051 %X We postulated that perinatal risk factors for asthma would be associated with early exposure to bacteria or bacterial products. To evaluate this hypothesis, we assessed circulating-free bacterial DNA (cfbDNA) in umbilical cord blood from mother-child pairs (see Table E1 in this article's Online Repository at www.jacionline.org) from Project Viva, a longitudinal study from birth through childhood.1 To assess cfbDNA, we used 16s rRNA sequencing of the V1-3 region from circulating DNA isolated from umbilical cord blood serum. %U https://www.jacionline.org/article/S0091-6749(18)31277-6/abstract