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Related Concept Videos

Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

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Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
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V4020 Venezuelan Equine Encephalitis Vaccine: Mitigating Neuroinvasion and Reversion Through Rational Design.

Adrian Centers1, Koji Barnaby1, Sidney Goedeker1

  • 1School of Medicine, University of Louisville, 505 S. Hancock Street, Louisville, KY 40202, USA.

Viruses
|August 28, 2025
PubMed
Summary

A new Venezuelan equine encephalitis virus (VEEV) vaccine, V4020, shows no neuroinvasion in mice, unlike the older TC-83 vaccine. This investigational VEEV vaccine offers a safer alternative with reduced risks.

Keywords:
VEEVenezuelan equine encephalitislive attenuated VEEV vaccineneuroinvasionpseudoreversion

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Area of Science:

  • Virology
  • Vaccinology
  • Neuroscience

Background:

  • Venezuelan equine encephalitis virus (VEEV) poses a significant threat to both humans and equines.
  • Current live-attenuated VEEV vaccines, like TC-83, face challenges due to reactogenicity and neuroinvasion potential.
  • There is a critical need for safer and more effective VEEV vaccines.

Purpose of the Study:

  • To evaluate the neuroinvasion potential and safety of V4020, a novel TC-83-based VEEV vaccine candidate.
  • To compare the neuroinvasive properties of V4020 with the existing TC-83 vaccine in a murine model.
  • To assess the genetic stability and reversion potential of V4020.

Main Methods:

  • Administered V4020 and TC-83 vaccines subcutaneously and intramuscularly to a murine model.
  • Monitored mice for clinical signs of central nervous system (CNS) infection.
  • Performed sequencing analysis on recovered viruses from CNS tissues to identify genetic mutations and reversion events.

Main Results:

  • The TC-83 vaccine demonstrated detectable neuroinvasion in a subset of mice, with virus replication in the CNS.
  • Sequencing revealed a pseudoreversion (E2 R120I) in TC-83 recovered from the brain, linked to reduced attenuation.
  • V4020 exhibited no detectable virus in the CNS, indicating a lack of neuroinvasion and highlighting its engineered safety features.

Conclusions:

  • V4020 is a rationally designed VEEV vaccine candidate with significantly reduced neuroinvasion risk compared to TC-83.
  • The engineered safety features of V4020, including synonymous codons to prevent reversion, enhance its safety profile.
  • V4020 represents a promising and safer alternative for VEEV vaccination in humans and equines.