[Numerical classification of enterococci].

The taxonomic analysis of enterococci by a mathematical method has revealed that these organisms are subdivided, according to their properties, into three taxons; of these, two taxons correspond to the species known as Streptococcus faecalis and Streptococcus faecium, while the third taxon, sharply different from the rest, comprises mobile enterococci which can be probably regarded as a separate species and differentiated from the other two species by a number of characteristics.