Comparison of Histopathology, Serology and PCR for the Diagnosis of Malignant Catarrhal Fever

Malignant Catarrhal Fever의 병리조직학적 진단과 혈청학적 진단 및 PCR 진단법의 비교

  • Kim, Ok-jin (Department of Agriculture, Animal Disease Research Unit, ARS) ;
  • Crawford, Timothy B. (Department of Veterinary Pathology, College of Veterinary Medicine, Washington State University)
  • 김옥진 (미국 농무부 동물질병연구소) ;
  • Accepted : 2003.06.18
  • Published : 2003.09.25

Abstract

Malignant catarrhal fever (MCF) is a systemic disease of ruminants caused by ovine herpesvirus 2 (OvHV-2). OvHV-2 is a gamma herpesvirus, which induces frequent latent infection and often difficult to detect its antigens and even specific nucleic acids because of its low viral copies in the infected tissues. Histopathology, serology and polymerase chain reaction (PCR) were compared for the diagnosis of MCF using 10 bison infected with OvHV-2. Histopathological diagnosis was performed using the criteria which was based upon the pathognomic lesions. Serological diagnosis was conducted using its serum with competitive ELISA for the detection of antibodies of OvHV-2. Also, the nest PCR was performed with peripheral blood leukocytes for the detection of OvHV-2-specific DNAs. Primers 556 and 775 were used for the primary amplification, and primers 556 and 555 were used for the secondary amplification. As the results, positive cases were 6 by histopahology, 9 by serology and 10 by PCR. As comparing with other diagnostic methods, PCR was found to be more sensitive than histopathology and serology. The recent development of molecular diagnostic assays has provided powerful tools for investigating how viruses survive in nature. Development of PCR specific for viruses has dramatically improved the accuracy of diagnosis of viruses in clinically infected animals. Furthermore, amplification of viral genomic material by nest PCR represents the most sensitive method for the detection of viruses and might be detected successfully even though very low viral DNA copies. So, it could be used as the first choice for the detection of viral DNAs with low copies such as the status of latent infection. However, it has also some limitation of application like as false negative results by PCR inhibitors and false positive results by contamination. The results of this study suggest that the use of molecular biological methods like PCR may increase the accuracy for the diagnosis of infectious diseases. However, in diagnostic laboratory, it is recommended that PCR assay must be conducted with other diagnostic methods for more reliable diagnosis.

References

  1. Baxter, S. I. F., Pow, I. and Bridgen, A. PCRdetection of the sheep-associated agent of malignantcatarrhal fever. Arch. Virol. 1993, 132, 145-159
  2. Collery, P. and Foley, A. An outbreak of malignantcatarrhal fever in cattle in the Republic of Ireland.Vet. Rec. 1996, 139, 16-17
  3. Fredriks, D. N. and Kelinan, D. A. Improved ampli-fication of microbial DNA from blood cultures byremoval of the PCR inhibitor sodium polyanethole-sulfonate. J. Clin. Microbiol. 1998, 36, 2810-2816
  4. Li, H., McGuire, T. C. and MuIler-Doblies, U. U. Asimpler, more sensitive competitive inhibition enzyme-linked immunosorbent assay for detection of antibodyto malignant catarrhal fever viruses. J. Vet. Diagn.Invest. 2001, 13, 361-364
  5. MuUer-Doblies, U. U., Li, H. and Hauser, B. Heldvalidation of laboratory tests for clinical diagnosis ofsheep-associated malignant catarrhal fever. J. Clin Microb. 1998, 36, 2970-2972
  6. Plowright, W. Malignant catarrhal fever virus. In Virus Infections of Ruminants, Dinter, Z and Morein, B. (eds). pp. 123-150. Elsevier, New York, 1990
  7. Taylor, G. R. and Logan, W. P. The Polymerase chain reaction: new variation and an old theme. Current Opinion in Biotechnology. 1995, 6, 24-29
  8. Ensser, A. and Pflam, R. Fleckenstein. Primarystructure of the alcelaphine herpesvirus 1 genome. J.Virol. 1997, 71, 6517-6525
  9. Bezold, G., Volkenandt, M. and Gottlober, P.Detection of herpes simplex virus and varicella-zostervirus in clinical swabs: frequent inhibition of PCR asdetermined by internal controls. Mol. Diagn. 2000, 5,279-284
  10. Li, H., Shen, D. T. and O'Tool, D. Investigation ofsheep-associated malignant catarrhal fever virus infectionin ruminants by PCR and competitive inhibition enzyme-linked immunosorbent assay. J. Clin. Microbiol. 1995,33, 2048-2053
  11. Reid, H. W., Buxton, D. and McKelvey, W. A. Malignant calarrhal fever in P$e^'$re-Davids deer. Vet. Rec. 1987, 121, 276-277
  12. Loken, T., Aleksandersen, M. and Reid, H.Malignant catarrhal fever caused by ovine herpesvirus2 in pigs in Norway. Vet. Rec. 1998, 143, 464-467
  13. Lager, K. M., Mengeling, W. L. and Brockmeier, S. L. Duration of homologous porcine reproductive andrespiratory syndrome virus immunity in pregnantswine. Vet. Microbiol. 1997, 58, 127-133
  14. Bridgen, A. and Reid, H. W. Derivation of DNAclone cotrespartling to the viral agsnt of sheep-associatedmalignant catan-hal fever. Res. Vet. Sci. 1991, 50, 38-44
  15. Cannan, B. Molecular techniques should now replacecell culture in diagnostic virology laboratories. Rev.Med. Virol. 2001, 11, 347-349
  16. Wedbrauk, D. L., Wemer, J. C. and Drevon, A. M. Inhibition of PCR by aqueous and vitreous fluids. J. Cin. Microbiol. 1995, 33, 2643-2646
  17. Reischl, U. Application of molecular biology-based methods to the diagnosis of infectious diseases. Front. Biosci. 1996, 1, 72-77
  18. Crawturd, T. B. and O'Toole, D. Malignant catarrhalfever, In Current Veterinary Therapy IV: Pood AninialPractice. Howard, J. L. (eds), pp. 306-309. W. B.Saundeis, Philadelphia, 1999
  19. O'Toole, D., Li, H. and Sourk, C. Malignantcatarrhal fever in a bison (Bison bison) feedlot,1993-2000. J. Vet. Diagn. Invest. 2002, 14, 183-193