Shaking Piglets (IMAGE) University of Veterinary Medicine -- Vienna Caption Suckling piglets can suffer a congenital tremor, which is caused by a so for undetectable virus, the atypical porcine pestivirus. Credit Michael Bernkopf/Vetmeduni Vienna Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.