http://en.wikipedia.org/wiki/Escherichia_coli
Escherichia coli encompasses an enormous population of bacteria that exhibit a very high degree of both genetic and phenotypic diversity. Genome sequencing of a large number of isolates of E. coli and related bacteria shows that a taxonomic reclassification would be desirable. However, this has not been done, largely due to its medical importance and E. coli remains one of the most diverse bacterial species: only 20% of the genome is common to all strains.
Escherichia coli encompasses an enormous population of bacteria that exhibit a very high degree of both genetic and phenotypic diversity. Genome sequencing of a large number of isolates of E. coli and related bacteria shows that a taxonomic reclassification would be desirable. However, this has not been done, largely due to its medical importance and E. coli remains one of the most diverse bacterial species: only 20% of the genome is common to all strains.
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