<prompt> Most dominant colonic bacteria isEscherichia coliBacteroidesClostridiumVeilonella  <response>: Bacteroids are the normal inhabitants of the intestine, respiratory, female genital tract. the normal flora of adult colon contains 96 to99 of anaerobes and only 1 to 4 of aerobes. Anaerobes - Bacteroides species, bifidobacteria, anaerobic lactobacilli, anaerobic streptococci. Ref: Baveja textbook of microbiology; 4th edition. 