Figure 5.

Prevalence of Bacteroides spp. in children, adults and across different geographical populations

In new born babies the prevalence of Bacteroides spp. depends upon the mode of birth and type of milk consumed during the first five months. Between 6–12 months, Bacteroides thetaiotaomicron is the most prevalent specie; however, other species may increase in number during chilhood. In adults, dietary patterns are the most important factors, and the prevalence of Bacteroides spp. may vary in a western vs non-western diet. Data adapted from Ref 67, 68, 72, 73, 74 and 75.