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Intestinal microbial introduction by vaginal delivery vs. Cesarean delivery. In vaginal delivery, infants obtain Lactobacillus via the vaginal canal. This promotes normal intestinal microbial colonization and development of a competent gut immune system. In contrast, in Cesarean delivery, infants obtain skin microbes, including Staphylococcus. This abnormal gut microbe introduction leads to altered intestinal microbial colonization and increases the risk of immunologic disorders.
