Esperimental Infection of Infectious Bovine Rhinotracheitis Virus to Rabbits Immunosuppressed with Dexamethasone

Dexamethasone으로 면역기능(免疫機能) 저하(低下)된 토끼에 Infectious Bovine Rhinotracheitis Virus 감염시험(感染試驗)

  • Min, Won-gi (Department of Veterinary Medicine, College of Agriculture, Chungnam National University) ;
  • Jun, Moo-hyung (Department of Veterinary Medicine, College of Agriculture, Chungnam National University) ;
  • Park, Seong-kuk (Department of Veterinary Medicine, College of Agriculture, Chungnam National University) ;
  • An, Soo-hwan (Veterinary Research Institute, Rural Development Administration) ;
  • Cha, Yeon-ho (Choongang Animal Disease Laboratory)
  • 민원기 (충남대학교 농과대학 수의학과) ;
  • 전무형 (충남대학교 농과대학 수의학과) ;
  • 박성국 (충남대학교 농과대학 수의학과) ;
  • 안수환 (농촌진흥청 가축위생연구소) ;
  • 차연호 (중앙가축전염병연구소)
  • Received : 1988.01.27
  • Published : 1988.04.30

Abstract

To establish a laboratory animal model for study on development of diagnostic methods for infectious bovine rhinotracheitis virus(IBRV), experimental infection of the virus to rabbits immunosuppressed with dexamethasone(DX) were carried out. Results obtained throughout the experiments were as follows. When lymphocyte activity was measured by lymphocyte transformation to phytohaemagglutinin in parallel with total and differential leucocyte counting, both groups treated with 2.0mg DX once and 1.0mg DX daily showed marked immunosuppression between 5 to 72 hrs. after administration. The degree of suppression of lymphocyte activities was more remarkable in the latter group. IBRV PQ7 strain at $10^{7.5}\;TCID_{50}/0.2ml$ was inoculated into conjunctival sacs of rabbits immunosuppressed with DX and non-treated. During 3 weeks observation, the immunosuppressed groups revealed mild conjunctivitis, viremia and virus recovery by 33.3 to 100%, whereas the DX nontreated group showed viremia and virus recovery with no clinical conjunctivitis by one of three rabbits(33.3%). In conclusion, it was indicated that experimental infection of IBRV PQ7 strain to rabbit was limited in prerequisite to immunologic modification by administration of immunosuppressive drugs.

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