It is generally accepted that, except for two biotypes of 6 (the Manchester and Newcastle biotypes), all members of the genus are anaerogenic. Two bacterial isolates are described which have O antigens identical to those of 13 and which cannot be distinguished biochemically from typical strains of that biotype except by their ability to produce gas from glucose and other fermentable substances. The relationship between these strains and the typical 13 is analogous to that between strains of the Manchester biotype and the typical 6.


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