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Unformatted text preview: Growth on EMB agar Electron Microsope showing flagella Causative agent: Escherichia coli 0157:H7 Category: Bacteria Kingdom: Bacteria Phyllum: Proteobacteria Order: Gamma proteobacteria Family: Enterobacteriaceae Genus: Escherichia Species: coli Serotype: 0157:H7 Disease: Not usually pathogenic:There are, however, three situations where the otherwise harmless E. coli can cause illness: 1. When the bacteria get out of the intestinal tract and into the urinary tract, they can cause an infection sometimes referred to as "honeymoon cystitis" because intercourse can lead to introduction of bacteria into the bladder. Although it is more common in females, urinary tract infection is seen in both males and females. It is found in roughly equal proportions in elderly men and women. Since bacteria invariably enter the urinary tract through the urethra, poor toilet hygiene can predispose to infection but other factors are also important (pregnancy in women, prostate enlargement in men) and in many cases the initiating event is unclear. Anal sex is also a risk factor for males. 2. When the bacteria get out of the intestinal tract through a perforation (a hole or tear, which could be caused by an ulcer, for example) and into the abdomen, they usually cause an infection called "peritonitis" that can be fatal. However, E. coli are extremely sensitive to and into the abdomen, they usually cause an infection called "peritonitis" that can be fatal....
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