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World Health Organisation – supervised interlaboratory comparison of ELISAs for the serological detection of Salmonella enterica serotype Enteritidis in chickens

Published online by Cambridge University Press:  15 May 2009

P. A. Barrow
Affiliation:
Institute for Animal Health, Compton Laboratory, Compton, Nr. Newbury, Berkshire, RG20 7NN, UK
M. Desmidt
Affiliation:
Faculty of Veterinary Medicine, University of Gent, Casinoplein 24, B-9000, Gent Belgium
R. Ducatelle
Affiliation:
Faculty of Veterinary Medicine, University of Gent, Casinoplein 24, B-9000, Gent Belgium
M. Guittet
Affiliation:
Laboratoire Central de Recherches Avicole et Porcine, Centre Nationale d'Etudes Veterinaires et Alimentaires (CNEVA), Beaucemaine, BP53, 22440 Ploufragan, France
H. M. J. F. van der Heijden
Affiliation:
Stichting Gezondheidsdienst voor Dieren in Zuid Nederland, Postbus 4, 5280 AA Boxtel, The Netherlands
P. S. Holt
Affiliation:
USDA Southeast Poultry Research Laboratory, PO Box 5657, Athens, Georgia 30604, USA
J. H. J. Huis in't Velt
Affiliation:
Department of the Science of Food of Animal Origin, Faculty of Veterinary Medicine, Utrecht University, The Netherlands
P. McDonough
Affiliation:
Diagnostic Laboratory, New York State College of Veterinary Medicine, Cornell University, PO Box 5786, Ithaca, New York 14853, USA
K. V. Nagaraja
Affiliation:
Department of Veterinary Pathobiology, College of Veterinary Medicine, University of Minnesota, 1971 Commonwealth Avenue, St Paul, Minnesota 55108, USA
R. E. Porter
Affiliation:
Animal Disease Diagnostic Laboratory, Purdue University, 1175 VADL, West Lafayette, Indiana 47907–1175, USA
K. Proux
Affiliation:
Laboratoire Central de Recherches Avicole et Porcine, Centre Nationale d'Etudes Veterinaires et Alimentaires (CNEVA), Beaucemaine, BP53, 22440 Ploufragan, France
F. Sisak
Affiliation:
Veterinary Research Institute, Hudcova 70, 621-32 Brno, Czech Republic
C. Staak
Affiliation:
Bunderinstitut für gesundheitlichen Verbraucherschutz und Veterinärmedizin, Postfach 33 00 13, D-14191, Berlin 33, Germany
G. Steinbach
Affiliation:
Bunderinstitut für gesundheitlichen Verbraucherschutz und Veterinärmedizin, Bereich Jena, D-07722 Jena, Germany
C. J. Thorns
Affiliation:
Central Veterinary Laboratory, New Haw, Weybridge, Surrey, KT15 3NB, UK
C. Wray
Affiliation:
Central Veterinary Laboratory, New Haw, Weybridge, Surrey, KT15 3NB, UK
F. van Zijderveld
Affiliation:
Central Veterinary Institute (CD-DLO), PO Box 65, NL-8200 AB, Lelystad, The Netherlands
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A collaborative exercise, supervised by the World Health Organisation, was set up to compare ELISAs used for the serological detection of Salmonella enteritica serotype Enteritidis in chickens. The aim was to ascertain how far agreement could be reached on the interpretation of optical density readings for high titre, intermediate titre and low titre sera. Two sets of sera were sent to 14 participants. The first set compared high, medium and low titre sera raised in specified-pathogen-free and commercial broiler breeder chickens. The second set comprised 20 sera of different antibody titres raised in commercial birds reared under laboratory conditions and sent blind. Both indirect and double-antibody sandwich blocking ELISAs were used with a number of different detecting antigens. With a few exceptions good agreement was reached on the interpretation of results obtained from high and low titre sera from the optical density obtained with a single serum dilution. Differences were observed in the interpretation of medium titre sera. The results suggested that most ELISAs produce reasonably comparable results and that practical problems may arise from interpretation of the results mainly as a result of the choice of the criteria used for differentiating sera obtained from infected and uninfected chickens. These problems are discussed.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1996

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