H1N1

Pathology.

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.

Origin of H1N1

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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for h1n1

In contrast, the 2009 H1N1 influenza pandemic infected 60 million Americans in just about the same five-month period of time.
What Ebola on a Plane Means for the U.S.|Kent Sepkowitz|August 7, 2014|DAILY BEAST
The U.S. Department of Health and Human Services recently that an unaccompanied minor from Central America has the H1N1 flu.
At Least Two ‘Border Kids’ Have Swine Flu|Ruben Navarrette Jr.|July 2, 2014|DAILY BEAST
It has not yet been confirmed that the children have the H1N1 virus, only that they have flu-like symptoms.
At Least Two ‘Border Kids’ Have Swine Flu|Ruben Navarrette Jr.|July 2, 2014|DAILY BEAST
More than 60 million Americans developed infection from the novel H1N1 strain, an almost unbelievable number.
How the Shutdown Could Make You Sick|Kent Sepkowitz|October 3, 2013|DAILY BEAST

In 2009 nearly all influenza cases were caused by the pandemic H1N1 virus, driving the previously dominant H3N2 underground.
Flu Fears: The Race Between Pandemic Viruses and a Universal Vaccine|John M. Barry|January 14, 2013|DAILY BEAST