What is swine influenza?
It is a respiratory disease of pigs caused by type A strains of the influenza virus. It regularly causes high flu outbreaks in pigs but with low death rates. There are four main sub-types of the virus, but the most recent isolated influenza viruses from pigs have been H1N1 viruses.
How does it spread?
Swine flu viruses do not typically infect humans though they do occur through close proximity or contact with infected pigs or contaminated areas. Cases of human-to-human spread have been documented.