Key clinical point: During transmission of gut bacteria from mothers to infants, the dominant maternal source of bacteria is rectal, and not vaginal.
Major finding: Out of 24 babies with persistent Bacteroides colonization in the gut, 22 (92%) were born vaginally, compared with 2 (8%) born via pre-labor C-section (not exposed to birth canal), and none born via post-labor C-section (exposed to birth canal).
Study details: A longitudinal trial involving 73 mothers and their newborns.
Disclosures: Dr. Yassour disclosed no conflicts of interest.
Yassour M et al. GMFH 2020.