Comparative Speed of Response of Previously Immunized and Non-Immunized Children to Fluid and Alum-Precipitated Diphtheria Toxoid

Abstract

97% of a group of 98 previously immunized children receiving a reimmunizing injn. of 0.5 ml. of fluid or alum-precipitated diphtheria toxoid developed 0.001 unit or more diphtheria antitoxin per ml. of serum within 10 days; at least 74% developed 0.001 unit or more within 5 days; at least 94% developed 0.01 unit or more and 88% developed 0.1 unit or more within 10 days. This reimmunizing procedure is recommended for use in the face of a threatening diphtheria epidemic for protection of previously immunized children.