David Earn (IMAGE) McMaster University Caption David Earn, senior author of the paper, is a Faculty of Science Research Chair in Mathematical Epidemiology and Professor of Mathematics at McMaster and Canada’s Global Nexus for Pandemics & Biological Threats. Credit McMaster University Usage Restrictions None. 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.