Bacteriophage genetic code-switching (IMAGE) DOE/Oak Ridge National Laboratory Caption ORNL scientists proved the theory that bacteria-destroying viruses called bacteriophages use genetic code-switching to first infect and later overwhelm their hosts. Credit Andrew Sproles/ORNL, U.S. Dept. of Energy Usage Restrictions Use image credit 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.