How Viral Infections Linger (IMAGE) University of Pennsylvania Caption Seemingly acute viral infections can persist in spite of viruses triggering an immune response. Researchers from the University of Pennsylvania found that cells enriched with defective viral genomes, labeled in green, were more likely to survive infection than cells with full-length viral genomes, labeled in yellow-orange. Credit University of Pennslyvania Usage Restrictions In context of reporting 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.