Observations on Some Biological Characteristics of Organisms of the Pleuropneumonia Group

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Abstract
8 types of microorganisms, at present designated as members of the Pleuropneumonia Group, were compared with respect to carbohydrate fermentations, oxidation-reduction potentials, methylene blue reduction, resistance to CO2, hemolysin production and resistance to u.-v. light, H2O2, and phenol. While all strains fermented glucose and contained a lactic dehydrogenase, they gave dissimilar time-potential curves. From the data available it was not possible to classify Pleuropneumonia bovum, Asterococcus canis, the L1, L3, L4 and L5 or- ganisms, and Streptobacillus monilijormis on the basis of metabolic characteristics. None of these strains other than L5 produce a filterable exotoxin when tested in mice.