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Clinical and Diagnostic Laboratory Immunology, March 2004, p. 302-312, Vol. 11, No. 2
1071-412X/04/$08.00+0     DOI: 10.1128/CDLI.11.2.302-312.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Innate Immune Responses of Calves during Transient Infection with a Noncytopathic Strain of Bovine Viral Diarrhea Virus

Doris Müller-Doblies,1 Adrian Arquint,2 Patrick Schaller,3 Peter M. H. Heegaard,4 Monika Hilbe,2 Sarah Albini,1 Carlos Abril,1 Kurt Tobler,1 Felix Ehrensperger,2 Ernst Peterhans,3 Mathias Ackermann,1 and Alfred Metzler1*

Institute of Virology, Veterinary Medical Faculty,1 Institute of Veterinary Pathology, University of Zurich, CH-8057 Zurich,2 Institute of Veterinary Virology, University of Bern, CH-3012 Bern, Switzerland,3 Department of Immunology and Biochemistry, Danish Veterinary Institute, DK-1790 Copenhagen V, Denmark4

Received 6 October 2003/ Returned for modification 19 November 2003/ Accepted 8 January 2004

In this study, six immunocompetent calves were experimentally infected with a noncytopathic strain of bovine viral diarrhea virus (BVDV), and the effects of the viral infection on parameters of the innate immune response of the host were analyzed. Clinical and virological data were compared with the temporal activation of the alpha/beta interferon-regulated Mx gene in white blood cells (WBC) and skin as well as the upregulation of the acute-phase serum proteins haptoglobin (Hp) and serum amyloid A (SAA). The viral strain used did provoke transient health impairment, namely, fever and leukopenia that were associated with viremia, viral shedding with nasal secretions, and antiviral seroconversion. Complete recovery was observed within 3 weeks. Elevated levels of SAA and Hp were apparent from days 4 to 13 and 8 to 11, respectively. In WBC, the levels of Mx mRNA and Mx protein were elevated from days 2 to 15. In the context of this study with BVDV, the level of Mx protein expression in WBC provided the most telling diagnostic window to monitor the host's ongoing innate immune response.

* Corresponding author. Mailing address: Institute of Virology, Veterinary Medical Faculty, University of Zurich, Winterthurerstrasse 266a, CH-8057 Zurich, Switzerland. Phone: 41-1-6358742. Fax: 41-1-6358911. E-mail: ametzler{at}vetvir.unizh.ch.

Clinical and Diagnostic Laboratory Immunology, March 2004, p. 302-312, Vol. 11, No. 2
1071-412X/04/$08.00+0     DOI: 10.1128/CDLI.11.2.302-312.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.





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Copyright © 2004 by the American Society for Microbiology. All rights reserved.