Walk, Seth T.; Alm, Elizabeth W.; Gordon, David; Ram, Jeffrey L.; Toranzos, Gary A.; Tiedje, James M.; Whittam, Thomas S.
Extended multilocus sequence typing (MLST) analysis of atypical Escherichia isolates was used to identify five novel phylogenetic clades (CI to CV) among isolates from environmental, human, and animal sources. Analysis of individual housekeeping loci showed that E. coli and its sister clade, CI, remain largely indistinguishable and represent nascent evolutionary lineages. Conversely, clades of similar age (CIII and CIV) were found to be phylogenetically distinct. When all Escherichia lineages...[Show more]
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