The ratio of anaerobe to aerobes in stool is
The mean number of bacteria in colon exceeds 10^11 bacteria/ gram of faecal matter. Approximately 99.9% of these bacteria are anaerobic in the colon. 300 to 400 different species or types of bacteria can be found. So the ratio of anaerobes to aerobes in the stool is 1000:01. Ref: Baveja textbook of microbiology; 4th edition.
10:01
100:01:00
1000:01:00
10000 : 1
general microbiology