Pandemic red-alert zones - infographic (IMAGE) University of Sydney Caption Illustrative map of 'red-alert' zone. Circles represent approximate location of risk; circle size indicates level of risk. Credit Michael Walsh, University of Sydney 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.