According to the pathogenic mechanism: urethritis Urinary tr ry aci stir infection infection out of elonephritis the intestine Sepsis Normal flora Meningitis EPEC infection inside the intestine: ETEC Diarrheal diseases EIEC Pathogenic organisms EAEC STEC Extremely common world widely Affecting human at all ages Sometimes cause blood diarrheainfection out of the intestine infection inside the intestine: Diarrheal diseases Sepsis Meningitis EPEC ETEC EIEC EAEC STEC Normal flora Pathogenic organisms Urinary tract infection urethritis cystitis pyelonephritis Extremely common world widely Affecting human at all ages Sometimes cause blood diarrhrea According to the pathogenic mechanism: