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IN an earlier paper' preliminary observations were reported suggesting that those previously immunized would respond quickly to a single injection of either flufid or alum-precipitated diphtheria, toxoid. It was felt that this observation might be of value to the health officer faced with an epidemic of diphtheria in a partially immunized community. He might be well advised to give a single injection of fluid or alum-precipitated toxoid to all those with a history of previous diphtheria immunization. This study was designed to give more conclusive evidence on the quickness of the response of previously immunized children and to determine whether there was any difference in the quickness of the response following fluid

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