948 THE PLEUROPNEUMONIA GROUP OF ORGANISMS 



and were non-pathogenic to animals. Strains A and C were antigenically distinct ; strain B 

 was more closely related to A than to C. Pirie (1937) found certain metabolic differences 

 between strains A and C Similar organisms have been isolated by Seiffert (1937o, b) 

 from soil, manure, and related substances. These saprophytic forms can grow in the 

 absence of high concentrations of natural animal proteins. 



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