MRSA in Petri Dish (IMAGE) Columbia University Irving Medical Center Caption MRSA bacteria are efficiently killed by specially designed UVC light-diffusing fibers laid over a petri dish. Credit David Welch, Ph.D., Columbia University Vagelos College of Physicians and Surgeons Usage Restrictions Include photo credit. 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.