VIRUS DISEASES OF THE NERVOUS SYSTEM

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Abstract
The clinical pictures of virus diseases of the nervous system do not depend on peculiarities of the viruses which cause them but on the location of the lesions produced. Irritative and destructive agents, regardless of their characteristics, produce similar clinical pictures if and when they attack the same parts of the brain and cord. In view of this fact, the determination of the kind of virus involved in individual cases, and at times in epidemics, can be made only by laboratory procedures. Frequently, pathologic examinations do not suffice, and additional informaton must be obtained by the isolation and identification of the etiologic agent or by serologic tests in order to be assured of correct diagnoses. One might not be surprised to find it difficult or impossible from clinical observations to distinguish between the St. Louis type of encephalitis and the eastern or western equine types. On the other hand, many

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