Worms on a plate (IMAGE) Penn State Caption To study the outcomes of virus spillover, researchers placed small amounts of a virus onto petri-dish plates harboring populations of different Caenorhabditis species to see if the virus could replicate. Credit David Kennedy, Penn State Usage Restrictions Educational use only License Original 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.