Oysters (IMAGE) Smithsonian Caption These are slides of oysters suffering different intensities of Dermo as the Perkinsus parasite multiplies, from healthy (left) to severely infected (right). Credit SERC Marine Ecology Lab 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.