Coral reef (IMAGE) University of Texas at Arlington Caption The research shows that living with algae changes how the jellyfish’s immune system works, making them more vulnerable to bacteria. Researchers believe that the polyps with symbiotic algae are more likely to die due to bacterial infection because their immune response was stronger and with more inflammation, causing more damage to their cells. Credit Photo courtesy UT Arlington Usage Restrictions none 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.