Daniel Sweeney, MD (IMAGE) University of California - San Diego Caption Co-author Daniel Sweeney, MD, notes the samples he has collected throughout the hospital, while wearing personal protective equipment (PPE). Credit UC San Diego Health Sciences Usage Restrictions Use photo credit 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.