Collaborative study for the calibration of a replacement international standard for diphtheria toxoid adsorbed

Biologicals : Journal of the International Association of Biological Standardization
Paul StickingsD Sesardic

Abstract

We present the results of a collaborative study for the characterization of a preparation of diphtheria toxoid adsorbed, and its calibration in terms of the 3rd International Standard (IS) for Diphtheria Toxoid Adsorbed. Calibration was performed using established World Health Organization (WHO) and European Pharmacopoeia (Ph. Eur.) protection models. Two candidate toxoid preparations were included in the study, one of which was adopted as a replacement Ph. Eur. Biological Reference Preparation (BRP, batch 4) in February 2009. The second candidate preparation was found to have a unitage of 213 IU/ampoule based on the calibration by in vivo bioassay in 19 laboratories in 16 countries, and was established as the 4th IS for Diphtheria Toxoid Adsorbed by the WHO Expert Committee on Biological Standardization (ECBS) in October 2009. The study also assessed performance of the replacement standard in mouse and guinea pig serological assays which are used as alternative procedures for diphtheria potency testing. Participants tested both candidate preparations and potency was expressed in relative terms only. Results suggest that the replacement standard is suitable for use as the reference vaccine in serological assays and that the Ver...Continue Reading

References

Apr 15, 1995·Lancet·P A MapleD Sesardic
Oct 3, 2001·Biologicals : Journal of the International Association of Biological Standardization·D SesardicR Gaines-Das
Sep 19, 2009·Journal of Immunological Methods·Laura CoombesDorothea Sesardic

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Citations

Oct 12, 2011·Biologicals : Journal of the International Association of Biological Standardization·Rob TierneyDorothea Sesardic

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