Escherichia coli NC101, a single isolate that acts as an AIEC (see below) in mice with serotype O2:H6/41
Groups of strains
Taken literally, all "strains" can become a "group of strains" once random mutation is allowed to run its course. This section specifically lists groups that are not defined by common descent, but by a common phenotype (e.g. ability to cause a certain disease).
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