One hundred strains of were characterized. Strains now recognized as belonging to the species were excluded. Seven serotypes of showed some correlation with cell wall lipids, colony types, temperature tolerance, Bönicke's biotypes, and other properties. Serotype I was frequently associated with disease, whereas serotype II, although common in the environment, never was. subsp. and subsp. belong to serotypes I and V, respectively; the other serotypes were not considered worthy of special subspecific designation. A list of the constant and variable characteristics of is given.


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