Researchers at Iowa State University have pinpointed the virus that causes a mysterious trembling in piglets that in severe cases prevents them from nursing and can lead to starvation, said Feedstuffs. The affliction, sometimes called “shaker pigs” or “dancing pigs,” dates back more than 90 years and is uncommon. The virus that causes the ailment comes from a family known as pestiviruses. Veterinary researchers used a new type of DNA sequencing to identify the virus causing the involuntary tremors. The next step is to develop a vaccine against the virus. The research team says the virus is not known to infect humans and does not affect the safety of pork from animals with the virus.