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Albert V. Hardy, Thelma DeCapito, Seymour P. Halbert, Studies of the Acute Diarrheal Diseases: XIX. Immunization in Shigellosis, Public Health Reports (1896-1970), Vol. 63, No. 21 (May 21, 1948), pp. 685-688
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Hardy et al. (1948) studied this question.
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