ATYPICAL FLEXNER DYSENTERY

Abstract
The Jersey City outbreak is a repetition of incidents known with regard to bacillary dysentery since Shiga first described the causative organism in 1898 in Japan, and Flexner in 1899 in the Philippines. The outbreaks in the United States have been due almost entirely to the acid-producing type represented by the Flexner Y and Sonne strains. Though serologically and bacteriologically distinct, these organisms have many characteristics in common. The paradysentery strains of Castellani and similar organisms described by other investigators probably belong to this group and illustrate the heterogeneous nature of the dysentery bacillus. Nelson considers Castellani's paradysentery identical with Sonne dysentery. One of us (J. F.) recently described an outbreak of the latter disease in New York City, which was terminated a few months before the inception of the Jersey City epidemic. The similarity of the clinical, bacteriologic and immunologic features in these two outbreaks was so marked that

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