(CNN)Here's a look at the H1N1 influenza virus, also known as swine flu. There was a pandemic outbreak across the globe which lasted from 2009 to 2010.
The H1N1 virus is a type of swine flu.
Swine flu is not common in humans. Occasionally, human infections with swine flu occur in people who have been exposed to pigs (e.g. children near pigs at a fair or workers in the swine industry).
1930 - The classical swine flu virus (an influenza type A H1N1 virus) is first isolated from a pig.