Abstract

THE virulence of organisms can be enhanced by a variety of substances, mainly of carbohydrate nature (see review by Olitzki1). Current interest centres on mucin, which was found by Smith and his co-workers2–4 to owe its activity to the synergic action of three factors—viscosity, a particulate residue and a heparin. The present communication shows that bacteriological peptone and some of its hydrolysis products also have considerable virulence-enhancing activity.

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