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H1N1

American  
Pathology.
  1. a subtype of the type A influenza virus, with strains that give rise to seasonal epidemics, or sometimes pandemics, including a strain with swine, avian, and human genes responsible for swine flu.


Etymology

Origin of H1N1

First recorded in 1970–75; abbreviation of h(aemagglutinin type)1 and n(euraminidase type) 1


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

He advised each of the last seven U.S. presidents on new viral epidemics faced by the world, including multiple recurrences of Ebola, HIV/AIDS, Sars-CoV-1, H1N1 Influenza, Zika and then Sars-CoV-2, which causes Covid-19.

From The Wall Street Journal ● Aug. 7, 2026

Public health scientists at the Columbia University Mailman School of Public Health used advanced computer simulations to trace how the 2009 H1N1 flu pandemic and the 2020 COVID-19 pandemic spread across the United States.

From Science Daily ● Feb. 7, 2026

There are also signs a different strain of flu - H1N1 - is picking up in Europe and may lead to an increase in cases here too.

From BBC ● Dec. 19, 2025

Right now the U.S. poultry industry is under tremendous threat from H1N1 bird flu.

From Salon ● Jan. 24, 2025

He put a human flu virus — H3N2 — into one pig, and a swine flu virus — H1N1 — into another.

From Los Angeles Times ● Nov. 26, 2024

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