Final tests confirm that six pigs from the Minnesota State Fair in the US contracted swine flu - and officials said yesterday they believe the animals contracted the virus from people who visited the show.
The US Agriculture Department said follow-up tests confirmed the presence of the H1N1 virus, more commonly known as swine flu, in six samples taken as a part of a university research project at the Minnesota State Fair between August 26 and September 1.
The tests confirmed the first cases of pigs contracting swine flu in the United States.
Officials say the pigs showed no signs of sickness and believe they contracted the virus from close to 1.8 million people who visited the fair.
The US Agriculture Department stressed that swine flu cannot be contracted by eating pork products.