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Influenza viruses cause seasonal flu and pandemics by infecting vertebrates. Their high mutation rates and genome reassortment can create novel pandemic strains, posing a significant public health threat.

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Area of Science:

  • Virology
  • Infectious Diseases
  • Public Health

Background:

  • Influenza viruses cause seasonal epidemics and pandemics.
  • Influenza A, B, and C viruses infect humans and other vertebrates.
  • High mutation rates and genome reassortment in Influenza A viruses contribute to novel pandemic strains.

Purpose of the Study:

  • To summarize the natural history, replication cycle, and pathogenesis of influenza viruses.
  • To highlight the mechanisms of influenza virus infection and spread.
  • To underscore the pandemic potential of influenza viruses, including avian strains.

Main Methods:

  • Infographic summarizing key aspects of influenza virus biology.
  • Review of viral structure, entry, replication, and assembly.
  • Discussion of host-pathogen interactions and evolutionary mechanisms.

Main Results:

  • Influenza viruses infect respiratory epithelium via HA or HEF proteins binding to sialic acid.
  • Viral genome replication occurs in the host cell nucleus, unusual for RNA viruses.
  • New virions assemble at the cell surface and are released via NA or HEF proteins.

Conclusions:

  • Influenza viruses possess high adaptability due to mutation and reassortment, enabling immune evasion and pandemic emergence.
  • Avian influenza subtypes (H5, H7) pose a potential pandemic threat.
  • Understanding influenza virus replication and pathogenesis is crucial for public health preparedness.