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Hydrolysis of casein: a differential aid for the indentification of Serratia marcescens
  1. William A. Salisbury,
  2. Joseph J. Likos
  1. Veterans Administration Hospital, Phoenix, Arizona, USA


    Through the hydrolysis of casein, a cultural characteristic has been established in the preliminary identification of Serratia marcescens. Compared against 438 strains of the families, Pseudomonadaceae and Enterobacteriaceae, this organism has a reproducible capability to decompose casein, while most other Gram-negative bacilli failed to produce any hydrolysis, or, at the most, hazy zones only. Routine use has shown this to be a valuable differential aid in the identification of Serratia marcescens.

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