The microbiome composition of the infants who are normally delivered is more similar to their mother’s vaginal flora and hence more diverse. However, those born via C-section have a less diverse composition that is similar to their mother’s skin flora. Children born via C-section have a greater risk of developing allergies and asthma. Source: Gaufin T, Tobin NH, Aldrovandi GM.

The importance of the microbiome in pediatrics and pediatric infectious diseases. Current opinion in pediatrics. 2018 Feb 1;30(1):117-24. How can you extrapolate this information to the role of microbiome in preventing infectious diseases such as HIV?