<prompt> In the gut flora, anaerobic bacteria outnumber the aerobes by a ratio of:10:01100:01:001000:01:0010,000:1  <response>: The stomachs acidity keeps the number of microorganisms at a minimum 102-103mL of contents. In the adult duodenum, there are 103-104 bacteriamL of effluent; with higher populations in the jejunum, 104-105 bacteriamL, and ileum, 108 bacteriamL; and in the cecum and transverse colon, 1011 bacteriamL. In the sigmoid colon and rectum, the bacteria constitute about 60 of the fecal mass. Anaerobes outnumber facultative organisms by 1000-fold. In diarrhea, the bacterial content may diminish greatly, but in intestinal stasis, the count rises. Ref: Brooks G.F. 2013. Chapter 10. Normal Human Microbiota. In G.F. Brooks Ed, Jawetz, Melnick, Adelbergs Medical Microbiology, 26e. 