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Fecal Transplants: What Is Being Transferred?

Fig 1

The growth of fecal transplants as reflected in references in PubMed and the estimated composition of human feces.

The charts show (A) the rapid rise in publications on fecal transplants in the National Library of Medicine's search service (PubMed), particularly between 2012 and 2015, and (B) the estimated upper concentration of the biological entity per gram of unprocessed human feces, as cited in the text. Estimates do not necessarily reflect the viable number of the biological entity, and the concentration of the archaea is estimated from a methanogen breath test that is not solely based on the presence of archaea. Concentrations of metabolites, protists, and other entities were not identified.

Fig 1