Some Growth Requirements of Erysipelothrix and Listerella

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Abstract
A study of the growth requirements of 2 strains of E. rhusiopathiae and of 1 strain of L. monocytogenes led to the development for each of simple media allowing heavy growth. Growth of both organisms was measured by titration of acid production. Both E. rhusiopathiae and L. monocytogenes required one or more aminq acids supplied as a casein or gelatin hydroly-sate. All strains required riboflavin. E. rhusiopathiae required in addition qleic acid, which replaced the serum supplement. The oleic acid was rendered non-inhibitory in the presence of an adequate conc, of saponin. The occurrence and some of the properties of unidentified growth factors for both organisms were briefly described.

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