Chest x-rays (IMAGE) University of Waterloo Caption Chest x-rays used in the COVID-Net study show differing infection extent and opacity in the lungs of COVID-19 patients. Credit University of Waterloo Usage Restrictions To be used with this press release or stories about the research covered in this press release 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.