An anonymous reader quotes a report from The Guardian: The trial, led by the University of Edinburgh’s Roslin Institute, showed that the pigs were completely immune to porcine reproductive and respiratory syndrome (PRRS), a disease that is endemic across the globe and costs the European pig industry nearly $2 billion in pig deaths and decreased productivity each year.
Pigs infected with PRRS are safe to eat but the virus causes the animals breathing problems, causes deaths in piglets and can cause pregnant sows to lose their litter. There is no effective cure or vaccine, and despite extensive biosecurity measures about 30% of pigs in England are thought to be infected at any given time. After deleting a small section of DNA that leaves pigs vulnerable to the disease, the animals showed no symptoms or trace of infection when intentionally exposed to the virus and when housed for an extended period with infected siblings. The study has been published in the Journal of Virology.
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