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Journal of Clinical Microbiology, November 2000, p. 4160-4166, Vol. 38, No. 11
Department of Parasitology, Tulane Regional
Primate Research Center, Tulane University Health Sciences Center,
Covington, Louisiana 704331; Department
of Population Medicine and Diagnostic Science2
and James A. Baker Institute for Animal
Health,3 New York State College of
Veterinary Medicine, Cornell University, Ithaca, New York 14853;
and Department of Veterinary Clinical Sciences, Louisiana
State University School of Veterinary Medicine, Baton Rouge,
Louisiana 708034
Received 15 June 2000/Returned for modification 23 August
2000/Accepted 30 August 2000
Sera collected from dogs experimentally infected with
Borrelia burgdorferi by tick inoculation were analyzed for
an antibody response to each of the six invariable regions (IRs; i.e.,
IR1 to IR6) of VlsE, the variable surface
antigen of B. burgdorferi. Six synthetic peptides
(C1 to C6), which reproduced the six IR sequences were used as peptide-based, enzyme-linked immunosorbent assay
(ELISA) antigens. Two IRs, IR2 and IR6, were
found to be immunodominant. Studies with serially collected serum
samples from experimentally infected dogs revealed that the antibody
response to IR6 appears earlier and is stronger than that
to IR2. Thus, the IR6 sequence alone appeared
to be sufficient for serodiagnosis. When C6 alone was used
as antigen, the peptide-based ELISA was positive in 7 of 23 dogs (30%)
as early as 3 weeks postinfection. All dogs (n = 33)
became strongly positive 1 or 2 weeks later, and this response
persisted for the entire study, which lasted for 69 weeks. Of 55 sera
submitted by veterinarians from dogs suspected of having Lyme disease,
19 were also positive by the C6 ELISA, compared to 20 positives detected by immunoblot analysis using cultured B. burgdorferi lysates as antigen. The sensitivity of using
C2 and C6 together for detecting specific
antibody in both experimentally infected and clinically diagnosed
dogs was not better than sensitivity with C6 alone,
confirming that C6 suffices as a diagnostic probe.
Moreover, the C6 ELISA yielded 100% specificity with serum
samples collected from 70 healthy dogs, 14 dogs with infections other
than B. burgdorferi, and 15 animals vaccinated with either
outer surface protein A, whole-spirochete vaccines, or the common
puppy-vaccines. Therefore, this C6 ELISA was both sensitive
and specific for the serodiagnosis of canine Lyme disease and could be
used with vaccinated dogs.
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Copyright © 2000, American Society for Microbiology. All rights reserved.
Characterization of a Borrelia burgdorferi VlsE
Invariable Region Useful in Canine Lyme Disease Serodiagnosis by
Enzyme-Linked Immunosorbent Assay
*
Corresponding author. Mailing address: Tulane Regional
Primate Research Center, Tulane University Health Sciences Center, 18703 Three Rivers Rd., Covington, LA 70433. Phone: (504) 871-6221. Fax: (504) 871-6390. E-mail: philipp{at}tpc.tulane.edu.
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