Prevalence of Mycobacterium bovis infection in cervids on privately owned ranches

John B. Kaneene Population Medicine Center, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824.

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 DVM, MPH, PhD
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Michael VanderKlok Michigan Department of Agriculture, Animal Industries Division, Veterinary Services, State Office Building, 350 Ottawa NW, Lansing, MI 48909.

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Colleen S. Bruning-Fann USDA:APHIS, Veterinary Services, 3001 Coolidge Rd, Ste 125, East Lansing, MI 48823.

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 DVM, MS, DACVPM
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Mitchell V. Palmer Bacterial Diseases of Livestock Diseases Research Unit, National Animal Disease Center, Agricultural Research Service, USDA, 2300 Dayton Ave, Ames, IA 50010.

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Diana L. Whipple Bacterial Diseases of Livestock Diseases Research Unit, National Animal Disease Center, Agricultural Research Service, USDA, 2300 Dayton Ave, Ames, IA 50010.

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Stephen M. Schmitt Wildlife Disease Laboratory, Rose Lake Wildlife Research Station, Michigan Department of Natural Resources, 8562 E Stoll Rd, East Lansing, MI 48823.

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RoseAnn Miller Population Medicine Center, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48824.

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Abstract

Objective—To determine prevalence of tuberculosis caused by infection with Mycobacterium bovis in cervids on privately owned ranches in northeastern lower Michigan.

Design—Epidemiologic survey.

Animals—Cervids on 96 privately owned ranches.

Procedures—A combination of slaughter and skin tuberculin testing was used to collect data. Infection with M bovis was confirmed by use of standard necropsy and bacteriologic culture techniques.

Results—Cervids with tuberculosis were detected on 1 of the 96 ranches. The apparent prevalence of tuberculosis in cervids from the 96 ranches was 1.1 cases/100 cervids (21 cases/1,867 cervids tested). For the ranch with infected cervids, prevalence of infection with M bovis was 12.1 cases/100 cervids (21 cases/174 cervids tested). No obvious gross lesions were seen in 8 of 21 white-tailed deer and 1 coyote with culture-confirmed M bovis infection.

Conclusions and Clinical Relevance—The lack of visible lesions in a substantial proportion of infected animals should be taken into consideration in studies involving detection and prevalence of tuberculosis. (J Am Vet Med Assoc 2002;220:656–659)

Abstract

Objective—To determine prevalence of tuberculosis caused by infection with Mycobacterium bovis in cervids on privately owned ranches in northeastern lower Michigan.

Design—Epidemiologic survey.

Animals—Cervids on 96 privately owned ranches.

Procedures—A combination of slaughter and skin tuberculin testing was used to collect data. Infection with M bovis was confirmed by use of standard necropsy and bacteriologic culture techniques.

Results—Cervids with tuberculosis were detected on 1 of the 96 ranches. The apparent prevalence of tuberculosis in cervids from the 96 ranches was 1.1 cases/100 cervids (21 cases/1,867 cervids tested). For the ranch with infected cervids, prevalence of infection with M bovis was 12.1 cases/100 cervids (21 cases/174 cervids tested). No obvious gross lesions were seen in 8 of 21 white-tailed deer and 1 coyote with culture-confirmed M bovis infection.

Conclusions and Clinical Relevance—The lack of visible lesions in a substantial proportion of infected animals should be taken into consideration in studies involving detection and prevalence of tuberculosis. (J Am Vet Med Assoc 2002;220:656–659)

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