where is the most bacteria found in the human body
Human microbiota The gut flora has the largest numbers of bacteria and the greatest number of species compared to other areas of the body.[6] In humans the gut flora is established at one to two years after birth, and by that time the intestinal epithelium and the intestinal mucosal barrier that it secretes have co-developed in a way that is tolerant to, and even supportive of, the gut flora and that also provides a barrier to pathogenic organisms.[19][45]
Small intestine Absorption of the majority of nutrients takes place in the jejunum, with the following notable exceptions:
Ascaris lumbricoides Infections with these parasites are more common where sanitation is poor,[10] and raw human feces are used as fertilizer.
Stomach In classical anatomy, the human stomach is divided into four sections, beginning at the gastric cardia,[6] each of which has different cells and functions.