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    VACCINATED persons, when exposed to the same risk of taking smallpox as unvaccinated persons, are attacked at a lower rate, and those who are attacked die at a lower rate than persons who have not been vaccinated. No one who is acquainted with the direct and collateral evidence doubts that this is a generally true proposition, unless they are on a priori grounds convinced that vaccination must be nonsense. As Prof. Major Greenwood pointed out to the Royal Statistical Society on Feb. 18, direct numerical evidence of the lower attack and lower fatality rates of vaccinated persons has been obtained whenever the distinction between vaccinated and unvaccinated has been recorded. Recent advances in understanding have all confirmed our belief in the efficacy of vaccination as an individual prophylactic.

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