Abstract
Clinical features of the disease and case histories illustrating mild and severe forms are given. Descriptions of the causative organism and its reactions are given in detail. The metadysentery bacilli described by Castel-lani are shown to be identical with E. paradysenteriae Sonne, while E. dispar, described by Andrewes, is shown to be entirely different from these organisms. Attention is drawn to the fact that E. paradysenteriae Sonne is important as a cause of dysentery in the U. S. A., as indicated by this study.

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