J. G. Wooley, Charles Armstrong, The Distribution of Immunity against Encephalitis Virus of the St. Louis Type in the United States as Determined by the Serum-Protection Test in White Mice, Public Health Reports (1896-1970), Vol. 49, No. 50 (Dec. 14, 1934), pp. 1495-1505
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Wooley et al. (1934) studied this question.