Order of authorship in the original publication: Shao, Forster, Tsaliki....The authors used whole genome sequencing to characterize the microbiota of caesarian babies, demonstrating that caesarian babies were not colonized with healthy mothers' microbiomic species, but by opportunistic pathogens from the hospital environment. "This analysis demonstrates that the mode of delivery is a significant factor that affects the composition of the gut microbiota throughout the neonatal period and into infancy."

(Thanks to Juan Weiss for this reference and its interpretation.)