EPIDEMIC OF ENCEPHALITIS, PREDOMINANTLY ST. LOUIS TYPE, IN PINAL COUNTY, ARIZ.
- 21 March 1942
- journal article
- research article
- Published by American Medical Association (AMA)
- Vol. 118 (12) , 961-964
- https://doi.org/10.1001/jama.1942.02830120025007
Abstract
Encephalomyelitis in horses has been present throughout Arizona for a number of years, but human encephalitis has rarely been reported.1 During the summer of 1941 equine encephalomyelitis again appeared and soon afterward cases of human encephalitis began to occur in several parts of the state. In Pinal County, in southern Arizona, 18 human cases were studied during the months June to November. All but 3 of the patients were hospitalized. The etiologic diagnosis was established in most instances by repeated virus neutralization tests. Although the coincident equine outbreak pointed toward the western equine strain as the probable cause, the virus neutralization studies suggest that two viruses were responsible, western equine and St. Louis, with the latter greatly predominating. Clinically the cases could not be divided into two groups. Since the discovery of the St. Louis encephalitis virus during the epidemic of 19332 it has been shown to beKeywords
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