ACUTE PHASE OF JAPANESE B ENCEPHALITIS

Abstract
An epidemic of Japanese B encephalitis occurred in American soldiers in Korea in the late summer and fall of 1950. The purpose of this paper is to present the clinical and pathological picture as seen in the acute phase of the disease. The clinical and laboratory approach is not as detailed as would be ideally desired; however, the relatively limited resources of an evacuation hospital in a combat area and the heavy daily inflow of battle casualties during the time of the epidemic made more detailed study impractical. HISTORY Summer encephalitides have long been recognized in Japan. Outbreaks occurred as early as 1871. In 1936 the virus of Japanese B encephalitis was isolated, and thus the disease was definitely separated from von Economo's encephalitis lethargica, which the Japanese designated type A encephalitis. Major outbreaks of Japanese B encephalitis occurred in Japan in 1924, 1935, and 19481; on Okinawa in

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