Tracing the virus' evolution (IMAGE) Duke-NUS Medical School Caption Prof Gavin Smith traces the virus' evolution Credit Norfaezah Abdullah, Duke-NUS Medical School Usage Restrictions Credit: Norfaezah Abdullah, Duke-NUS 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.