Abstract
Immunization against diphtheria has in recent years received more attention from pediatricians and health workers than any other phase of preventive medicine. Within the last year there has come into general use a new method which, because it has the great advantage of requiring only one injection, promises to displace all other methods of accomplishing such immunization. Much has been written by laboratory and health workers on the use of a single dose of alum toxoid, but little if any of this has appeared in the pediatric literature, and yet it is the practicing physician and especially the pediatrician who in the final analysis is most interested. It is for this reason, and in the hope of stimulating enough interest to secure the necessary clinical evaluation, that I take this opportunity for discussing the new method. Since the days of von Behring, who first neutralized diphtheria toxin with antitoxin in

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