"In health the blood, body fluids, and tissues are sterile" is asserted in an early 21st century edition of Sherris Medical Microbiology. Although a confident statement the matter has been one of recurring controversy throughout the past century as research groups led by Guido Tedeschi and Virginia Livingston describe a microbe of atypical form that is apparently intrinsic to blood.  However despite considerable effort this "blood microbe" had not been successfully cultured or its properties adequately defined through other means.
As this lack of success suggested the possibility of a life form extremely adapted to blood my approach was to investigate its properties in the "near-blood" environment of raw blood lysate. The following discussion is largely based on this work performed over the past decade; topics include:
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Thomas D. Detwiler (2016)