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Influenza A Virus Studies in a Mouse Model of Infection

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Published on: September 7, 2017

The Spanish flu.

Patrick Berche¹

¹Professeur Emeritus, Université de Paris, France.

Presse Medicale (Paris, France : 1983)

|June 6, 2022

Summary

This summary is machine-generated.

The 1918 Spanish flu pandemic, caused by the H1N1 influenza virus, killed 50-100 million people due to its high lethality and lack of medical interventions. Its origins and the high mortality in young adults remain debated.

Keywords:

Asian flu 1957 Encephalitis lethargica H1N1 H2N2 H3N2 Hemagglutinin Hong-Kong flu 1968 Influenzae Myxovirus influenzae Neuraminidase Pandemic Pandemic H1N1 flu 2009 Spanish flu Von Economo

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Area of Science:

Epidemiology
Virology
Public Health

Background:

The 1918 Spanish flu pandemic occurred during WWI, with populations weakened by war and lacking medical advancements like vaccines or antibiotics.
Initial understanding of the infectious agent was flawed, with some suspecting bacteria rather than a virus.

Observation:

The pandemic spread globally in successive waves, with the second wave being the most lethal (2-4% mortality).
Young adults (20-40 years) were disproportionately affected, often succumbing to pneumonia and bacterial superinfections.
The influenza virus (Myxovirus influenzae) was identified decades later, with key virulence factors hemagglutinin and neuraminidase discovered in the 1940s.

Findings:

The 1918 H1N1 virus, originating from birds, was sequenced and found to be significantly more virulent than seasonal strains.
Mutations in the hemagglutinin H1 gene may explain the increased affinity for human cell receptors and higher lethality.
The exact origin of the Spanish flu virus and the reasons for its specific impact on young adults are still debated.

Implications:

Understanding the 1918 pandemic's virology and epidemiology provides crucial insights for managing contemporary viral outbreaks.
The historical challenges faced highlight the importance of ongoing research in vaccine development, antiviral therapies, and pandemic preparedness.