Seroprevalence of equine granulocytic anaplasmosis and lyme borreliosis in Canada as determined by a point-of-care enzyme-linked immunosorbent assay (ELISA) |
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| Authors: | Gili Schvartz Tasha Epp Hilary J Burgess Neil B Chilton David L Pearl Katharina L Lohmann |
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| Institution: | Department of Large Animal Clinical Sciences (Schvartz, Epp, Lohmann), Department of Veterinary Pathology (Burgess), Western College of Veterinary Medicine, and Department of Biology (Chilton), University of Saskatchewan, 52 Campus Drive, Saskatoon, Saskatchewan S7N 5B4; Department of Population Medicine, Ontario Veterinary College, University of Guelph, 50 Stone Road, Guelph, Ontario N1G 2W1 (Pearl). |
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| Abstract: | Equine granulocytic anaplasmosis (EGA) and Lyme borreliosis (LB) are an emerging concern in Canada. We estimated the seroprevalence of EGA and equine LB by testing 376 convenience serum samples from 3 provinces using a point-of-care SNAP® 4Dx® ELISA (IDEXX Laboratories, Westbrook, Maine, USA), and investigated the agreement between the point-of-care ELISA and laboratory-based serologic tests. The estimated seroprevalence for EGA was 0.53% overall (0.49% in Saskatchewan, 0.71% in Manitoba), while the estimated seroprevalence for LB was 1.6% overall (0.49% in Saskatchewan, 2.86% in Manitoba). There was limited agreement between the point-of-care ELISA and an indirect fluorescent antibody test for EGA (kappa 0.1, PABAK 0.47) and an ELISA/Western blot combination for LB (kappa 0.23, PABAK 0.71). While the SNAP® 4Dx® ELISA yielded expected seroprevalence estimates, further evaluation of serologic tests for the purposes of disease exposure recognition may be needed. |
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