where is escherichia coli found in the human body
Escherichia coli Escherichia coli (/ˌɛʃɪˈrɪkiə ˈkoʊlaɪ/;[1] also known as E. coli) is a Gram-negative, facultatively anaerobic, rod-shaped, coliform bacterium of the genus Escherichia that is commonly found in the lower intestine of warm-blooded organisms (endotherms).[2][3] Most E. coli strains are harmless, but some serotypes can cause serious food poisoning in their hosts, and are occasionally responsible for product recalls due to food contamination.[4][5] The harmless strains are part of the normal microbiota of the gut, and can benefit their hosts by producing vitamin K2,[6] and preventing colonization of the intestine with pathogenic bacteria, having a symbiotic relationship.[7][8] E. coli is expelled into the environment within fecal matter. The bacterium grows massively in fresh fecal matter under aerobic conditions for 3 days, but its numbers decline slowly afterwards.[9]
Wastewater If the wastewater contains human feces, as is the case for sewage, then it may also contain pathogens of one of the four types:[2][3]
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.