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Volume 14, Number 4—April 2008

Research

Rapid Typing of Transmissible Spongiform Encephalopathy Strains with Differential ELISA

Stéphanie Simon*, Jérôme Nugier*, Nathalie Morel*, Hervé Boutal*, Christophe Créminon*, Sylvie L. Benestad†, Olivier Andréoletti‡, Frédéric Lantier§, Jean-Marc Bilheude¶, Muriel Feyssaguet¶, Anne-Gaëlle Biacabe#, Thierry Baron#, and Jacques Grassi*Comments to Author 
Author affiliations: *Commissariat à l’Energie Atomique, Gif-sur-Yvette, France; †National Veterinary Institute, Oslo, Norway; ‡Institut National de la Recherche Agronomique-Ecole Nationale Vétérinaire de Toulouse, Toulouse, France; §Infectiologie Animale et Santé Publique, Tours, France; ¶Bio-Rad, Marnes-la-Coquette, France; #Agence Française de Sécurité Sanitaire des Aliments, Lyon, France;

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Figure 2

Determination of the A/A’ ratio. A dilution series was assayed for each analyzed sample to determine the optimal range that would permit precise determination of the A/A′ratio (absorbance ranging from 0.5 to 2.5 absorbance units in A reagent). A) A/A′ratio is close to 1 for PK-resistant prion protein (PrPres) associated with classic scrapie strains (manual protocol, see Experimental Procedures) and B) close to 10 for experimental ovine bovine spongiform encephalopathy (BSE)–associated PrPres. C) To minimize interassay variations, the ratio obtained for each sample is thus normalized by dividing by the ratio obtained for the ovine BSE sample.

Figure 2. Determination of the A/A’ ratio. A dilution series was assayed for each analyzed sample to determine the optimal range that would permit precise determination of the A/A′ratio (absorbance ranging from 0.5 to 2.5 absorbance units in A reagent). A) A/A′ratio is close to 1 for PK-resistant prion protein (PrPres) associated with classic scrapie strains (manual protocol, see Experimental Procedures) and B) close to 10 for experimental ovine bovine spongiform encephalopathy (BSE)–associated PrPres. C) To minimize interassay variations, the ratio obtained for each sample is thus normalized by dividing by the ratio obtained for the ovine BSE sample.

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