The recent outbreak of epidemic encephalitis in St. Louis (summer, 1933) attracted considerable attention because it seemed different in many aspects from other epidemics. First, the seasonal incidence did not correspond with that of the great European epidemics which occurred at the end of, or shortly after, the World War. The report of the Matheson Commission1 gave a detailed review of the different epidemics, indicating that most of the cases occurring between 1917 and 1927 were observed during the first quarter of the year, with a climax in February or March. The same is true of the epidemics of encephalitis in the United States during the years 1918 to 1928. The St. Louis epidemic, like the Japanese epidemics of 1924 and 1927, occurred during the summer, with a maximum in August and September. It should be noted, however, that, according to the League of Nations Monthly Epidemiological Report for
WEIL A. HISTOPATHOLOGY OF THE CENTRAL NERVOUS SYSTEM IN EPIDEMIC ENCEPHALITIS(ST. LOUIS EPIDEMIC). Arch NeurPsych. 1934;31(6):1139–1152. doi:10.1001/archneurpsyc.1934.02250060025002
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