Bovine adenovirus serotype 7 infections in postweaning calves

Genny M. Fent Department of Veterinary Pathobiology, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078.

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Robert W. Fulton Department of Veterinary Pathobiology, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078.

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Jeremiah T. Saliki Department of Veterinary Pathobiology, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078
Oklahoma Animal Disease Diagnostic Laboratory, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078.

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Shannon L. Caseltine Oklahoma Animal Disease Diagnostic Laboratory, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078.

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Howard D. Lehmkuhl National Animal Disease Center, Agricultural Research Service (ARS) USDA, Ames, IA 50010.

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Anthony W. Confer Department of Veterinary Pathobiology, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK 74078.

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Charles W. Purdy USDA, ARS, Conservation and Production, Bushland, TX 79012.

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Robert E. Briggs National Animal Disease Center, Agricultural Research Service (ARS) USDA, Ames, IA 50010.

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Raymond W. Loan Department of Veterinary Pathobiology, College of Veterinary Medicine, Texas A&M University, College Station, TX 77843.

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Glenn C. Duff Clayton Livestock Research Center, New Mexico State University, Clayton, NM 88415.
Present address is the Department of Animal Sciences, University of Arizona, Tucson, AZ 85721.

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Abstract

Objective—To detect bovine adenovirus serotype 7 (BAV-7) infections in calves by use of viral isolation and serologic testing.

Animals—205 postweaning calves.

Procedure—121 calves were assembled by an order buyer through auction markets in eastern Tennessee and transported to New Mexico where they were commingled with 84 healthy ranch-reared calves. Tests included viral isolation in cell culture from peripheral blood leukocytes (PBL) and detection of serum BAV-7 antibodies by use of microtitration viral neutralization.

Results —BAV-7 was isolated from PBL of 8 calves and seroconversion to BAV-7 was detected for 38 of 199 (19.1%) calves. Concurrent bovine viral diarrhea virus infections were detected in most calves from which BAV-7 was isolated.

Conclusions and Clinical Relevance —Results of our study indicate that BAV-7 infections can be found in postweaning commingled calves and may develop more commonly in calves with concurrent infections with viruses such as bovine viral diarrhea virus (BVDV). (Am J Vet Res 2002;63:976–978).

Abstract

Objective—To detect bovine adenovirus serotype 7 (BAV-7) infections in calves by use of viral isolation and serologic testing.

Animals—205 postweaning calves.

Procedure—121 calves were assembled by an order buyer through auction markets in eastern Tennessee and transported to New Mexico where they were commingled with 84 healthy ranch-reared calves. Tests included viral isolation in cell culture from peripheral blood leukocytes (PBL) and detection of serum BAV-7 antibodies by use of microtitration viral neutralization.

Results —BAV-7 was isolated from PBL of 8 calves and seroconversion to BAV-7 was detected for 38 of 199 (19.1%) calves. Concurrent bovine viral diarrhea virus infections were detected in most calves from which BAV-7 was isolated.

Conclusions and Clinical Relevance —Results of our study indicate that BAV-7 infections can be found in postweaning commingled calves and may develop more commonly in calves with concurrent infections with viruses such as bovine viral diarrhea virus (BVDV). (Am J Vet Res 2002;63:976–978).

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