<prompt> Bacterial count in doudenum105 per gram10 per gram1010 per gram102 per gram  <response>: Ans. is a i.e., 105 per gram In GIT of an adult : Duodenum - -4 103 - 106 bacteria per gram. Jejunum and proximal ileum - 10 - 108 bacteria per gram Lower ileum and cecum - 108 - 1010 bacteria per gram Colon and rectum - 10 - 1012 bacteria per gram Colon and rectum have maximum number of bacteria and most of them 96-99 are anaerobes : Anaerobic streptococci Clostridia Anaerobic lactobacilli Bacteroides 