Why Some Bad Infections Persist (IMAGE) University of Utah Health Caption Research shows how pathogenic bacteria modify some of the basic rules of molecular biology so they can better survive in their host. Credit National Institute of Allergy and Infectious Diseases, National Institutes of Health Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. License CC BY-NC 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.