humans >90%: wild mammals 56%: birds 23%: reptiles 10 %
||Tenaillon O, Skurnik D, Picard B, Denamur E. The population genetics of commensal Escherichia coli. Nat Rev Microbiol. 2010 Mar8(3):207-17. doi: 10.1038/nrmicro2298 p.207 right column bottom paragraphPubMed ID20157339
|| Gordon DM, Cowling A. The distribution and genetic structure of Escherichia coli in Australian vertebrates: host and geographic effects. Microbiology. 2003 Dec149(Pt 12):3575-86 DOI: 10.1099/mic.0.26486-0  Mitsuoka T, Hayakawa K. [The fecal flora in man. I. Composition of the fecal flora of various age groups]. [Article in German] Zentralbl Bakteriol Orig A. 1973 Mar223(2):333-42  Penders J et al., Factors influencing the composition of the intestinal microbiota in early infancy. Pediatrics. 2006 Aug118(2):511-21 DOI: 10.1542/peds.2005-2824PubMed ID14663089, 4145840, 16882802
||Primary source  abstract: "Escherichia coli was isolated from more than 2300 non-domesticated vertebrate hosts living in Australia." Primary source  abstract: "Fecal samples from 1032 infants at 1 month of age, who were recruited from the KOALA Birth Cohort Study in the Netherlands, were subjected to quantitative real-time polymerase chain reaction assays for the enumeration of bifidobacteria, Escherichia coli, Clostridium difficile, Bacteroides fragilis group, lactobacilli, and total bacterial counts. Information on potential determinants of the gut microbiotic composition was collected with repeated questionnaires. The associations between these factors and the selected gut bacteria were analyzed with univariate and multivariate analyses."
||P.207 right column bottom paragraph: "In humans, the prevalence is more than 90% [primary sources 11,12], but it is only 56% in wild mammals, 23% in birds and 10% in reptiles [primary source 7]. " From Wikipedia-"Prevalence in epidemiology is the proportion of a particular population found to be affected by a medical condition (typically a disease or a risk factor such as smoking or seat-belt use)."