Drug Combination (IMAGE) Washington University School of Medicine Caption Using three antibiotic drugs thought to be useless against MRSA infection -- piperacillin and tazobactam (bottle on left) and meropenem -- Washington University researchers, led by Gautam Dantas, Ph.D., have killed the deadly staph infection in culture and in laboratory mice. Credit Robert Boston Usage Restrictions None 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.