Introduction

Swine flu, also called H1N1 flu, is a respiratory disease of pigs that has now spread to humans. "Swine" refers to animals such as pigs, hogs, and boars. "Flu" is an abbreviation of influenza. "H1N1" is the name of the virus that has spread to humans.

People do not normally get swine flu viruses, but human infections can and do happen. Beginning in late March 2009, cases of humans infected with the H1N1 flu virus have been reported in the USA and internationally.

This reference summary explains what the H1N1 flu is. It discusses its symptoms, when to seek medical help, and its treatment options. It also provides important prevention tips.