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Bluetongue: laboratory diagnosis

A Afshar1

  • 1Agriculture Canada, Animal Diseases Research Institute, Nepean, Ontario.

Comparative Immunology, Microbiology and Infectious Diseases
|August 1, 1994
PubMed
Summary

Accurate bluetongue virus (BTV) diagnosis relies on laboratory techniques for isolation and detection of BTV antigens, nucleic acids, and antibodies. Competitive ELISA (C-ELISA) is emerging as a highly sensitive and specific method for antibody detection, replacing older tests for trade and diagnosis.

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Area of Science:

  • Veterinary Virology
  • Immunology
  • Molecular Diagnostics

Background:

  • Bluetongue virus (BTV) infections in ruminants are often subclinical, necessitating reliable laboratory diagnostics.
  • Accurate diagnosis involves BTV isolation, antigen, nucleic acid, and antibody detection.

Purpose of the Study:

  • To review and compare various laboratory diagnostic techniques for bluetongue virus infection.
  • To highlight advancements in BTV diagnostic assays, particularly for antibody detection.

Main Methods:

  • BTV isolation from blood, semen, and tissues using embryonated eggs and cell cultures.
  • Conventional methods like fluorescent antibody staining and virus neutralization.
  • Advanced techniques including immunohistochemistry, immunoenzymatic assays, and molecular methods (PCR, hybridization).
  • Serogroup-specific antibody detection using agar gel immunodiffusion (AGID) and competitive ELISA (C-ELISA).
  • Serotype-specific antibody detection via microtiter serum neutralization (MTSN).

Main Results:

  • Conventional BTV isolation and identification methods are complemented by more rapid and sensitive techniques using monoclonal antibodies.
  • Molecular methods like PCR offer highly efficient BTV nucleic acid detection.
  • Competitive ELISA (C-ELISA) demonstrates superior sensitivity and specificity for detecting BTV antibodies compared to AGID.
  • C-ELISA is increasingly adopted for international trade certification and BTV diagnosis, replacing AGID.
  • Microtiter serum neutralization (MTSN) remains the standard for serotype-specific antibody detection and epidemiological surveillance.

Conclusions:

  • Modern diagnostic approaches, including molecular techniques and C-ELISA, significantly enhance bluetongue virus detection and diagnosis.
  • C-ELISA represents a validated, sensitive, and specific assay for BTV antibody detection, crucial for trade and disease control.
  • MTSN is essential for serotyping BTV and understanding epidemiological dynamics.

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