Evaluation of a diagnostic ELISA for insect bite hypersensitivity in horses using recombinant Obsoletus complex allergens.
Culicoides spp. of the Obsoletus complex belong to the most important species of midge, involved in causing insect bite hypersensitivity (IBH) in horses in The Netherlands. The aim of the current study was to evaluate seven different Obsoletus complex-derived recombinant allergens (Cul o 1-Cul o 7) and to compare these with Obsoletus complex whole body extract (WBE) in an IgE ELISA, using sera of 194 clinically-confirmed cases of IBH and 175 unaffected horses. The highest test accuracy was obtained with WBE, followed by Cul o 2, 3 and 5. Two ELISAs with a combination of recombinant allergens, Combi-1 (Cul o 3, 5 and 7) and Combi-2 (Cul o 1, 2, 5 and 7) were additionally performed and both resulted in high test accuracies close to that obtained with WBE. Combi-1 resulted in the best sensitivity and specificity, both 89%. Both Combi-1 and Combi-2 performed less well with samples collected in winter, but over 70% of the IBH-affected horses could still be identified. In conclusion, a combination of three Obsoletus complex recombinant allergens (Cul o 3, 5 and 7) could potentially replace Obsoletus complex WBE in an IgE ELISA for diagnosis of IBH in horses.
Cell Biology and Immunology Group, Wageningen University, De Elst 1, 6708 WD Wageningen, The Netherlands.
Nathalie M A
NM
van der Meide
Cell Biology and Immunology Group, Wageningen University, De Elst 1, 6708 WD Wageningen, The Netherlands.
Huub F J
HF
Savelkoul
Department of Infectious Diseases and Immunology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands.
Chantal
C
Meulenbroeks
Animal Breeding and Genomics Centre, Wageningen University, Wageningen, The Netherlands.
Bart J
BJ
Ducro
Cell Biology and Immunology Group, Wageningen University, De Elst 1, 6708 WD Wageningen, The Netherlands. Electronic address: Edwin.tijhaar@wur.nl.
Edwin
E
Tijhaar
D000485:Allergens / Q000276:immunology; D000818:Animals; D002519:Ceratopogonidae; D004797:Enzyme-Linked Immunosorbent Assay / Q000662:veterinary*; D006734:Horse Diseases / Q000175:diagnosis* / Q000276:immunology; D006736:Horses; D006967:Hypersensitivity / Q000175:diagnosis / Q000276:immunology / Q000662:veterinary*; D007073:Immunoglobulin E; D007299:Insect Bites and Stings / Q000276:immunology / Q000662:veterinary*; D009426:Netherlands; D012680:Sensitivity and Specificity
D000485:Allergens; D007073:Immunoglobulin E
Culicoides; Diagnostic IgE ELISA; Horse; Insect bite hypersensitivity; Obsoletus complex; Recombinant allergens