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Escherichia coli
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Revision as of 15:40, 21 December 2007
416 bytes added
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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
+
*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===
+
+
*Soft tissue infections in adult animals
+
*Most common organism infecting urinary tract
+
*Causes pyometra in the dog and cat and pyelonephritis
+
*Acute mastitis in lactating animals
+
*Pathogenesis:
+
**Produces an alpha-haemolysin which may be cytotoxic
+
**Iron aquisition system
+
**K antigens prevent phagocytosis or mimic host antigens and resist complement
+
**Fimbriae permit adhesion to mucosal surfaces
Flawrence
462
edits