The Delirious and the Meningo Radicular Types of Epidemic Encephalitis

Since my last report 1 of a number of cases of epidemic encephalitis, I have become convinced that the same unknown virus produces clinical forms in which lethargy and other common symptoms of the characteristic lethargic form may be lacking. That we are dealing with the same disease is shown by the similarity in pathologic anatomy, the existence of transitional forms, and the occurrence of all these forms in the same community at the same time. Among the cases observed during the past winter, several have presented severe symptoms of a general infection suggestive of typhoid fever, acute miliary tuberculosis or other acute infectious disease. In other cases, verified by necropsy, the resemblance to severe, acute chorea was marked. Among new symptoms I, too, have observed the twitching of the abdominal muscles to which Thomas F. Reilly 2 has recently called attention. One patient, now improving, had complete right hemiplegia