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*Most strains have low virulence
*Most strains have low virulence
*Found in many non-specific, endogenous infections, eg. wound infections, upper respiratory tract infections, infections of the urinary tract, mammary glands and uterus and septicaemia
*Found in many non-specific, endogenous infections, eg. wound infections, upper respiratory tract infections, infections of the urinary tract, mammary glands and uterus and septicaemia
*Also an enteropathogen, causing neonatal diarrhoea in young animals and enteric colibacillosis
*An enteropathogen, causing neonatal diarrhoea in young animals and enteric colibacillosis
*Enterotoxigenic ''E. coli'' is the most common cause of diarrhoea in calves, lambs and pigs
*Pathogenic strains possess virulence factors allowing colonisation of mucosal surfaces
*Pathogenic strains possess virulence factors allowing colonisation of mucosal surfaces
*Haemolytic activity on blood agar characteristic of certain strains
*Haemolytic activity on blood agar characteristic of certain strains
*Lactose fermenter
*Lactose fermenter
*Reduce nitrates to nitrits and ferment glucose to produce acid and gas
*Reduce nitrates to nitrites and ferment glucose to produce acid and gas
*Possess a lipolysaccharide (O) antigen, a flagellate (H) antigen, polysaccharide capsule (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