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English Abstract
Journal Article
[A simple method for assaying the activity of adsorbed tetanus toxoids].
The authors have developed a simplified activity test for Tetanus Toxoids Adsorbed, based on the comparison of antitoxin levels in mice 4 weeks after injection of a reference toxoid and of the vaccine to be tested. Titration of tetanus antitoxin is achieved by passive agglutination of turkey RBC sensitized by means of glutaraldehyde. After preliminary experiments establishing feasibility of this method, the authors have obtained reproducible and quantitative results. They observed an increase of the immune response by a booster and an immunostimulation when pertussis component is present. They have found close correlation in immunized mice between the titre of circulating antibodies and the survival/death response after challenge by tetanus toxin as done in the official control. This simplified method using a reduced number of animals, yields, nevertheless, quantified results with confidence limits. Thus it is suitable for laying down a norm and can in many cases take the place of the official potency test which is tedious, expensive and often criticized.
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