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Updated: Jun 16, 2026

Assessment of Intestinal Transcytosis of Neonatal Escherichia coli Bacteremia Isolates
Published on: February 17, 2023
Cesarean delivery and risk of intestinal bacterial infection
Peter Bager1, Jacob Simonsen, Steen Ethelberg
1Dept of Epidemiology Research, Statens Serum Institut, 5 Artillerivej, DK-2300 Copenhagen S, Denmark. bg@ssi.dk
Background:
An individual's intestinal bacterial flora is established soon after birth. Delivery by Cesarean section (c-section) deprives the newborn of colonization with maternal vaginal bacteria. We determined whether delivery by c-section is associated with an altered risk of infection with intestinal bacterial pathogens.
Methods:
In a cohort of 1.7 million Danes born 1973-2005 we identified cases of laboratory-confirmed non-typhoidal Salmonella species, Campylobacter species, Yersinia enterocolitica, Shigella species, and Shiga toxin-producing Escherichia coli from 1991-2005 in the National Registry of Enteric Pathogens. Using Poisson-regression we estimated confounder-adjusted incidence rate ratios (IRRs) for infection according to mode of delivery.
Results:
During 14.0 million person-years of follow-up, 22,486 individuals were diagnosed with 1 intestinal bacterial infection. C-section was associated with a small increase in risk at age 1 to <2 years (IRR, 1.09; 95% confidence interval, 1.00-1.18) and at age 2 to <5 years (IRR, 1.08; 95% confidence interval, 1.00-1.17), but after age 5 years, there was no significant association. Assuming causality only 0.62% of intestinal bacterial infections were attributable to c-section.
Conclusions:
Mode of delivery appears not to be a clinically relevant determinant of risk for intestinal bacterial infections. The possible impact of increasing frequencies of c-section on the overall burden of intestinal bacterial infections appears negligible.
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