A lethal pig virus is sweeping across farms in the US.

Porcine Epidemic Diarrhea virus has killed around seven million baby pigs in the country.

"It's not known all the details, but it's very virulent, easily transmitted, hard to get rid of, especially on a soil pasture base like we are. Once it gets into the soil, there's-no getting rid of it," said pig farm owner Michael Yezzi.

This comes as the EU tightens rules on pig imports -- Ensuring imported pig blood used in some animal feed is free of the virus.

While this disease is not harmful to humans, it is affecting pigs in Canada and parts of Asia as well.

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