http://en.wikipedia.org/wiki/Escherichia_coli
A common subdivision system of E. coli, but not based on evolutionary relatedness, is by serotype, which is based on major surface antigens (O antigen: part of lipopolysaccharide layer; H: flagellin; K antigen: capsule), e.g. O157:H7).It is however common to cite only the serogroup, i.e. the O-antigen. At present about 190 serogroups are known.The common laboratory strain has a mutation that prevents the formation of an O-antigen and is thus non-typeable.
A common subdivision system of E. coli, but not based on evolutionary relatedness, is by serotype, which is based on major surface antigens (O antigen: part of lipopolysaccharide layer; H: flagellin; K antigen: capsule), e.g. O157:H7).It is however common to cite only the serogroup, i.e. the O-antigen. At present about 190 serogroups are known.The common laboratory strain has a mutation that prevents the formation of an O-antigen and is thus non-typeable.
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