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Liu J, Eberts M, Bewsey H, O'Connor TP, Chandrashekar R, Breitschwerdt EB. Sensitivity and specificity levels of two rapid assays for antibodies to Anaplasma spp. in dogs. J Vet Diagn Invest 2017; 30:290-293. [PMID: 29202672 DOI: 10.1177/1040638717745932] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Canine anaplasmosis is a tick-borne disease of dogs that results following infection with Anaplasma phagocytophilum or Anaplasma platys. The SNAP 4Dx Plus test (IDEXX Laboratories) and the VetScan Canine Anaplasma Rapid test (Abaxis) are commercial in-house rapid tests for the detection of antibody to these 2 antigenically related Anaplasma species. We evaluated 2 tests using serum and whole blood samples obtained from reference laboratories and veterinary hospitals. Samples were obtained from regions of the country known to be habitats of the primary tick vectors. The A. phagocytophilum sample set comprised 236 dog sera from the northeastern and midwestern United States; the A. platys sample set comprised 179 sera from dogs living in the southwestern United States. An indirect immunofluorescent antibody (IFA) test and an A. platys species-specific ELISA were used as reference assays for the A. phagocytophilum and A. platys samples, respectively. The SNAP test demonstrated significantly higher sensitivity (84.7% for A. phagocytophilum and 83.1% for A. platys), compared to the VetScan test (39.0% for A. phagocytophilum and 57.6% for A. platys). The specificity of the SNAP test (95.8% for A. phagocytophilum and 99.2% for A. platys) was significantly greater than the VetScan test (85.6% for A. phagocytophilum and 82.5% for A. platys). In a separate clinic study, conducted within an A. phagocytophilum-endemic state (Minnesota) using 154 whole blood samples from client-owned dogs, the VetScan test was negative for 22 of 39 SNAP and IFA seropositive samples.
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Affiliation(s)
- Jiayou Liu
- Department of Assay R&D, IDEXX Laboratories Inc., Westbrook, ME (Liu, Bewsey, O'Connor, Chandrashekar).,Lakeland Veterinary Hospital, N. Baxter, MN (Eberts).,Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC (Breitschwerdt)
| | - Matthew Eberts
- Department of Assay R&D, IDEXX Laboratories Inc., Westbrook, ME (Liu, Bewsey, O'Connor, Chandrashekar).,Lakeland Veterinary Hospital, N. Baxter, MN (Eberts).,Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC (Breitschwerdt)
| | - Hannah Bewsey
- Department of Assay R&D, IDEXX Laboratories Inc., Westbrook, ME (Liu, Bewsey, O'Connor, Chandrashekar).,Lakeland Veterinary Hospital, N. Baxter, MN (Eberts).,Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC (Breitschwerdt)
| | - Thomas P O'Connor
- Department of Assay R&D, IDEXX Laboratories Inc., Westbrook, ME (Liu, Bewsey, O'Connor, Chandrashekar).,Lakeland Veterinary Hospital, N. Baxter, MN (Eberts).,Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC (Breitschwerdt)
| | - Ramaswamy Chandrashekar
- Department of Assay R&D, IDEXX Laboratories Inc., Westbrook, ME (Liu, Bewsey, O'Connor, Chandrashekar).,Lakeland Veterinary Hospital, N. Baxter, MN (Eberts).,Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC (Breitschwerdt)
| | - Edward B Breitschwerdt
- Department of Assay R&D, IDEXX Laboratories Inc., Westbrook, ME (Liu, Bewsey, O'Connor, Chandrashekar).,Lakeland Veterinary Hospital, N. Baxter, MN (Eberts).,Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC (Breitschwerdt)
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