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416 bytes added ,  15:40, 21 December 2007
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*Grow on MacConkey agar (in presence of bile salts)
 
*Grow on MacConkey agar (in presence of bile salts)
 
*Reduce nitrates to nitrits and ferment glucose to produce acid and gas
 
*Reduce nitrates to nitrits and ferment glucose to produce acid and gas
*Possess a lipolysaccharide O antigen, a flagellate H antigen, polysaccharide K antigens and fimbrial F antigens
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*Possess a lipolysaccharide (O) antigen, a flagellate (H) antigen, polysaccharide capsule (K) antigens and fimbrial (F) antigens
 
*Epidemiological typing of ''E. coli'' uses antigen combinations, eg. O125:K12:H42
 
*Epidemiological typing of ''E. coli'' uses antigen combinations, eg. O125:K12:H42
       
===Extra-intestinal infection===
 
===Extra-intestinal infection===
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*Soft tissue infections in adult animals
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*Most common organism infecting urinary tract
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*Causes pyometra in the dog and cat and pyelonephritis
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*Acute mastitis in lactating animals
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*Pathogenesis:
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**Produces an alpha-haemolysin which may be cytotoxic
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**Iron aquisition system
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**K antigens prevent phagocytosis or mimic host antigens and resist complement
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**Fimbriae permit adhesion to mucosal surfaces
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