title: Development of an enzyme-linked immunosorbent assay for serodiagnosis of ringworm infection in cattle.
abstract: The aim of this study was to develop an in-house enzyme-linked immunosorbent assay (ELISA) for the serological diagnosis of ringworm infection in cattle. We used available recombinant forms of Trichophyton rubrum dipeptidyl peptidase V (TruDppV) and T. rubrum leucin aminopeptidase 2 (TruLap2), which are 98% identical to Trichophyton verrucosum orthologues. Field serum samples from 135 cattle with ringworm infection, as confirmed by direct microscopy, fluorescence microscopy, and PCR, and from 55 cattle without any apparent skin lesions or history of ringworm infection that served as negative controls were used. Sensitivities, specificities, and positive and negative predictive values were determined to evaluate the diagnostic value of our ELISA. Overall, the ELISAs based on recombinant TruDppV and TruLap2 discriminated well between infected animals and healthy controls. Highly significant differences (P < 0.0001, Mann-Whitney U test) were noted between optical density values obtained when sera from infected versus control cattle were tested. The ELISA developed for the detection of specific antibodies against DppV gave 89.6% sensitivity, 92.7% specificity, a 96.8% positive predictive value, and a 78.4% negative predictive value. The recombinant TruLap2-based ELISA displayed 88.1% sensitivity, 90.9% specificity, a 95.9% positive predictive value, and a 75.7% negative predictive value. To the best of our knowledge, this is the first ELISA based on recombinant antigens for assessing immune responses to ringworm infection in cattle; it is particularly suitable for epidemiological studies and also for the evaluation of vaccines and/or vaccination procedures.
authors.affiliation: Department of Parasitology and Parasitic Diseases, Faculty of Veterinary Medicine, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Cluj-Napoca, Romania.
authors.forename: Elena Tatiana
authors.initials: ET
authors.lastname: Bagut
authors.forename: Ludivine
authors.initials: L
authors.lastname: Cambier
authors.forename: Marie-Pierre
authors.initials: MP
authors.lastname: Heinen
authors.forename: Vasile
authors.initials: V
authors.lastname: Cozma
authors.forename: Michel
authors.initials: M
authors.lastname: Monod
authors.forename: Bernard
authors.initials: B
authors.lastname: Mignon
mesh_terms: D000818:Animals; D000908:Antibodies, Fungal / Q000097:blood*; D000946:Antigens, Fungal / Q000235:genetics; D002417:Cattle; D002418:Cattle Diseases / Q000175:diagnosis*; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases / Q000235:genetics; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D007931:Leucyl Aminopeptidase / Q000235:genetics; D011237:Predictive Value of Tests; D011994:Recombinant Proteins / Q000235:genetics; D012680:Sensitivity and Specificity; D012698:Serologic Tests / Q000379:methods; D014005:Tinea / Q000175:diagnosis / Q000662:veterinary*; D014249:Trichophyton / Q000235:genetics / Q000276:immunology*; D014730:Veterinary Medicine / Q000379:methods*
chemical_list: D000908:Antibodies, Fungal; D000946:Antigens, Fungal; D011994:Recombinant Proteins; D007931:Leucyl Aminopeptidase; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases