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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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Update on Human Rhinovirus and Coronavirus Infections.

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Human rhinoviruses (HRV) and coronaviruses (HCoV) cause respiratory illnesses, including the common cold and pneumonia. Increased understanding and new diagnostic methods highlight their importance, especially in vulnerable populations and those with chronic lung disease.

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Area of Science:

  • * Virology and infectious diseases, focusing on respiratory viruses.

Background:

  • * Human rhinoviruses (HRV) and coronaviruses (HCoV) are common causes of upper and lower respiratory tract illnesses.
  • * Recent decades have seen the emergence of new HRV and HCoV species.
  • * Advanced diagnostics have improved the understanding of these viruses in diverse host populations.

Purpose of the Study:

  • * To review the current understanding of HRV and HCoV infections.
  • * To emphasize the significance of these viruses in public health.
  • * To highlight the need for antiviral development, particularly for individuals with chronic lung conditions.

Main Methods:

  • * Literature review of recent advancements in HRV and HCoV research.
  • * Analysis of diagnostic techniques, including reverse transcription-polymerase chain reaction (RT-PCR).
  • * Examination of viral roles in immunocompetent and immunosuppressed individuals.

Main Results:

  • * HRV and HCoV infections range from the common cold to severe pneumonia.
  • * New viral species have been identified, expanding the known spectrum of disease.
  • * Enhanced diagnostic sensitivity has broadened the understanding of viral impact.

Conclusions:

  • * HRV and HCoV represent significant etiological agents of respiratory disease.
  • * The emergence of severe forms (e.g., SARS, MERS) necessitates vaccine development.
  • * Antiviral research is crucial, particularly for patients with chronic lung diseases like asthma.