title: Development of an in vitro potency test for tetanus vaccines: an immunoassay based on Hc fragment determination.
abstract: In the three Rs rule context, we have developed a method to quantify tetanus toxoid by ELISA detection of the specific Hc fragment. This fragment and several anti Hc fragment antibodies have been described as protective in mice models. By developing this assay, we have detected Hc presence in tetanus toxoid. Therefore, this functional in vitro assay could replace in vivo potency assays. We have evaluated the analytical performances of this ELISA in specificity, sensitivity, precision, and linearity tests on different combined vaccine formulations. This in vitro assay has been applied to various multi-component vaccines. Results are expressed in Lf Hc/ml with reference to a purified tetanus toxoid standard expressed in Lf/ml.
authors.affiliation: DLC Agence Française de Sécurité Sanitaire des Produits de Santé, Lyon, France. sonia.prieur@afssaps.sante.fr
authors.forename: S
authors.initials: S
authors.lastname: Prieur
authors.forename: S
authors.initials: S
authors.lastname: Broc
authors.forename: M
authors.initials: M
authors.lastname: Gal
authors.forename: B
authors.initials: B
authors.lastname: Poirier
authors.forename: F
authors.initials: F
authors.lastname: Fuchs
mesh_terms: D000826:Animal Testing Alternatives; D000818:Animals; D000906:Antibodies / Q000276:immunology / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D018073:Haemophilus Vaccines / Q000032:analysis; D006193:Haemophilus influenzae / Q000276:immunology; D007143:Immunoglobulin Heavy Chains / Q000737:chemistry / Q000378:metabolism; D051379:Mice; D012680:Sensitivity and Specificity; D013745:Tetanus Toxoid / Q000032:analysis* / Q000276:immunology
chemical_list: D000906:Antibodies; D018073:Haemophilus Vaccines; D007143:Immunoglobulin Heavy Chains; D013745:Tetanus Toxoid