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Immunogens of encephalitis viruses

J T Roehrig1

  • 1Division of Vector-Borne Infectious Diseases, Centers for Disease Control, Fort Collins, Colorado 80522.

Veterinary Microbiology
|November 1, 1993
PubMed
Summary

Equine encephalitis viruses, including WEE, EEE, and VEE, are mosquito-borne alphaviruses affecting horses. Research into their attenuation mechanisms, particularly for VEE, is crucial for developing effective vaccines and understanding viral evolution.

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Area of Science:

  • Virology
  • Veterinary Medicine
  • Immunology

Background:

  • Equine encephalitis viruses (WEE, EEE, VEE) are alphaviruses causing significant epizootic and enzootic infections in horses across the Western Hemisphere.
  • Transmission occurs via infected mosquito vectors, posing a continuous threat to equine populations.

Purpose of the Study:

  • To review the characteristics of equine encephalitis viruses and their associated vaccines.
  • To explore the structural components of alphaviruses, focusing on surface glycoproteins (E1, E2) relevant to protective immunity.
  • To highlight recent advancements in understanding alphavirus attenuation mechanisms through comparative genomic studies.

Main Methods:

  • Review of existing literature on equine encephalitis viruses and vaccine development.
  • Analysis of alphavirus structure, including genome composition and surface glycoproteins.
  • Comparative genomic analysis of virulent and avirulent Venezuelan equine encephalitis (VEE) virus strains.

Main Results:

  • Inactivated vaccines are currently used for WEE and EEE, while live attenuated VEE vaccines (e.g., TC-83) were developed due to issues with inactivated vaccine efficacy.
  • Monoclonal antibody studies have identified key protective antigens on the E1 and E2 glycoproteins.
  • Comparative genomics is beginning to reveal the genetic basis for alphavirus attenuation.

Conclusions:

  • Understanding alphavirus structure and attenuation is vital for improving equine encephalitis vaccines.
  • Further research into viral genetics and antigenicity will enhance control strategies against these important animal pathogens.

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