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Viruses with RNA Genomes01:29

Viruses with RNA Genomes

RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...

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Related Experiment Video

Updated: Jun 27, 2026

Expression and Purification of Virus-like Particles for Vaccination
06:17

Expression and Purification of Virus-like Particles for Vaccination

Published on: June 2, 2016

Third-generation flavivirus vaccines based on single-cycle, encapsidation-defective viruses.

Douglas G Widman1, Ilya Frolov, Peter W Mason

  • 1Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, Texas 77555, USA.

Advances in Virus Research
|December 17, 2008
PubMed
Summary

New flavivirus vaccines are needed, especially for emerging diseases like dengue and West Nile encephalitis. RepliVAX, a novel vaccine candidate, shows promise as a potent, safe, and economical third-generation option for flavivirus infections.

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Last Updated: Jun 27, 2026

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10:03

Generation of Recombinant Arenavirus for Vaccine Development in FDA-Approved Vero Cells

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Area of Science:

  • Virology
  • Vaccinology
  • Public Health

Background:

  • Flaviviruses are a significant global health threat, transmitted by arthropods and causing diseases like dengue and West Nile encephalitis.
  • Current flavivirus vaccines, including live-attenuated (LAVs) and inactivated (INVs), have limitations such as unsuitability for immunocompromised individuals or high production costs.
  • There is an unmet need for effective vaccines against emerging flavivirus diseases.

Purpose of the Study:

  • To review the current landscape of first- and second-generation flavivirus vaccine candidates.
  • To introduce and evaluate RepliVAX, a novel third-generation flavivirus vaccine candidate.
  • To compare RepliVAX with existing and developmental flavivirus vaccines.

Main Methods:

  • Review of existing literature on flavivirus vaccines.
  • Description of the development and characteristics of RepliVAX, a single-cycle, encapsidation-defective flavivirus vaccine.
  • Evaluation of RepliVAX's potency and efficacy in animal models for West Nile encephalitis and Japanese encephalitis.

Main Results:

  • RepliVAX can be produced using methods similar to LAVs, ensuring economic viability.
  • Due to a deleted C protein gene, RepliVAX cannot spread between cells or cause disease, ensuring safety.
  • RepliVAX demonstrated potency and efficacy in animal models for West Nile encephalitis and Japanese encephalitis.

Conclusions:

  • RepliVAX represents a promising third-generation flavivirus vaccine candidate.
  • This novel vaccine is potent, economical to produce, and safe for use, including in immunocompromised individuals.
  • RepliVAX could address the need for improved vaccines against existing and emerging flavivirus diseases.