. The substrates inositol, rhamnose, -tartrate and -tartrate used in fermentation tests with 338 cultures of differentiated strains in some phage types to give information that could be used in epidemiological investigations. Xylose in Bitter's medium, the fifth substrate by which 13 of a potential 32 biotypes were identified, differentiated few cultures with the negative character. The possession of a specific type of outer-membrane protein receptor for colicin M or bacteriophage ES18 and the particular type of ribosomal ribonucleic acid present, defined three groups among the phage-typed and biotyped cultures. The possibility that the serotype contains clones of different phylogenetic origin and the consequent implications for nomenclature are discussed.


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