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[Main features of the new influenza virus a pandemic (H1N1)]

Josep Vaqué Rafart1, Julita Gil Cuesta, María Brotons Agulló

  • 1Servicio de Medicina Preventiva y Epidemiología, Hospital Universitario Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, España. jvaque@vhebron.net

Medicina Clinica
|September 29, 2009
PubMed

Insights

A novel swine-origin influenza A (H1N1) virus emerged in 2009, causing a pandemic with rapid global spread. While generally mild, this new influenza strain primarily affected young individuals and prompted vaccine development.

Area of Science:

  • Virology
  • Epidemiology
  • Public Health

Context:

  • The 2009 H1N1 pandemic, also known as swine flu, emerged from a novel influenza A virus of swine origin.
  • The virus rapidly disseminated globally, reaching 74 countries within eight weeks and leading the World Health Organization (WHO) to declare a pandemic.

Purpose:

  • To describe the emergence, characteristics, and initial impact of the novel influenza A (H1N1) virus.
  • To analyze the genetic makeup, transmissibility, pathogenicity, and clinical manifestations of the pandemic strain.
  • To highlight the demographic affected and the development of control measures, including vaccination.

Summary:

  • A new swine-origin influenza A (H1N1) virus emerged in 2009, characterized by a unique genetic combination distinct from seasonal H1N1.
  • The virus exhibited slightly higher transmissibility than seasonal flu but low pathogenicity, with clinical presentations ranging from asymptomatic to severe pneumonia.
  • The pandemic disproportionately affected individuals under 30, with a significant number of severe cases and fatalities occurring in those without pre-existing chronic conditions.

Impact:

  • The pandemic underscored the potential for novel influenza viruses to cause widespread illness and mortality.
  • It highlighted the importance of rapid global surveillance and response to emerging infectious diseases.
  • The development of a specific monovalent vaccine aimed to control the spread by reducing the susceptible population.

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