Tohid Didar (IMAGE) McMaster University Caption McMaster researcher Tohid Didar was part of the team that developed a new plastic surface that repels all bacteria and viruses. Credit Georgia Kirkos, McMaster University 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.