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Clinical and Vaccine Immunology, November 2008, p. 1650-1658, Vol. 15, No. 11
1071-412X/08/$08.00+0     doi:10.1128/CVI.00251-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Antibody Responses of Cervids (Cervus elaphus) following Experimental Mycobacterium bovis Infection and the Implications for Immunodiagnosis {triangledown}

Noel P. Harrington,1,2* Om P. Surujballi,1 John F. Prescott,2 J. Robert Duncan,1 W. Ray Waters,3 Konstantin Lyashchenko,4 and Rena Greenwald4

Canadian Food Inspection Agency, Ottawa Laboratory Fallowfield, Ottawa, Ontario, Canada,1 Department of Pathobiology, University of Guelph, Guelph, Ontario, Canada,2 National Animal Disease Center, U.S. Department of Agriculture, Ames, Iowa,3 Chembio Diagnostic Systems, Inc., Medford, New York4

Received 11 July 2008/ Returned for modification 6 August 2008/ Accepted 12 September 2008

Captive and free-ranging wildlife animals are implicated in the maintenance and transmission of bovine tuberculosis and therefore pose a significant obstacle to eradication of the disease from domestic livestock. The current antemortem diagnostic method, the intradermal tuberculin skin test, is impractical for routine use with many wild animals. Antibody-based assays are particularly attractive because the animals are handled only once and immediate processing of the sample is not required. This report characterizes the antibody responses of red deer-elk hybrids (Cervus elaphus) against Mycobacterium bovis and subsequently evaluates the diagnostic performance of select antigens in a rapid-test format. Sequential serum samples were collected from 10 animals experimentally infected with M. bovis and 5 noninfected animals over a 7-month period postinfection (p.i.). Samples were evaluated by enzyme-linked immunosorbent assays, immunoblot analyses, and multiantigen print immunoassays for seroreactivity to mycobacterial antigens. Although all infected animals produced antibodies to M. bovis protein antigens, there was significant animal-to-animal variation in the kinetics and magnitudes of responses and the antigens recognized. The most frequently recognized antigens included MPB83, ESAT-6, CFP10, and MPB70. Responses to some antigens, such as MPB83, were consistently detected as early as 4 weeks after inoculation, whereas other antigens were detected only much later (>140 days p.i.). Antibody responses were boosted by injection of tuberculin for intradermal tuberculin skin testing. Comparison of single-antigen (fluorescence polarization assay) with multiantigen (CervidTB STAT-PAK) rapid tests demonstrated that a highly sensitive and specific serodiagnostic test for tuberculosis in cervids will require multiple and carefully selected seroreactive antigens covering a broad spectrum of antibody specificities.

* Corresponding author. Mailing address: Ottawa Laboratory Fallowfield, Canadian Food Inspection Agency, 3851 Fallowfield Road, Ottawa, Ontario K2H 8P9, Canada. Phone: (613) 228-6698, ext. 5922. Fax: (613) 228-6669. E-mail: harringtonnp{at}inspection.gc.ca

{triangledown} Published ahead of print on 24 September 2008.

Clinical and Vaccine Immunology, November 2008, p. 1650-1658, Vol. 15, No. 11
1071-412X/08/$08.00+0     doi:10.1128/CVI.00251-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

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