H1N1

Etymology
The strain classified as containing type 1, and  type 1.

Noun

 * 1)  A strain of influenza, the most common cause of flu in humans; also the strain responsible for swine flu.
 * 2) * 2010, Malcolm Knox, The Monthly, April 2010, Issue 55, The Monthly Ptd Ltd, page 44:
 * The current H1N1 virus (swine flu) is a mixture of avian flus that passed through pigs to humans.