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Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
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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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Updated: Dec 18, 2025

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[Coronavirus, emerging viruses].

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Coronaviruses are a major viral family infecting mammals and birds, with recent emergence of SARS-CoV-2 causing COVID-19. Research is urgently investigating candidate therapies due to the lack of approved vaccines or antivirals.

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Area of Science:

  • Virology
  • Infectious Diseases
  • Public Health

Background:

  • Coronaviruses are a diverse viral family known for cross-species transmission.
  • Three novel coronaviruses have emerged in the past two decades, including SARS-CoV-2.
  • The SARS-CoV-2 virus causes the ongoing COVID-19 pandemic.

Purpose of the Study:

  • To provide an overview of coronaviruses, focusing on SARS-CoV-2 and COVID-19.
  • To highlight the urgent need for effective therapeutic interventions.
  • To discuss the current landscape of candidate therapies under investigation.

Main Methods:

  • Review of existing literature on coronavirus biology and epidemiology.
  • Analysis of the genomic and structural characteristics of coronaviruses.
  • Survey of ongoing research into potential COVID-19 treatments.

Main Results:

  • Coronaviruses possess enveloped structures with positive-sense RNA genomes.
  • Viral replication relies on hijacking host cellular machinery.
  • No specific antiviral treatments or vaccines are currently approved for coronaviruses.

Conclusions:

  • The emergence of SARS-CoV-2 underscores the threat of novel coronaviruses.
  • Urgent development of vaccines and antivirals is critical.
  • Ongoing research into candidate therapies offers potential avenues for treatment.