Roughly 1 in 10 patients diagnosed with COVID-19 needed to return to the hospital within a week of discharge from an emergency department visit, according to data from the first three months of the COVID-19 outbreak in the Philadelphia region — March, April and May 2020. Researchers in the Perelman School of Medicine at the University of Pennsylvania also found that factors like lower pulse oximetry levels and fever were some of the most telling symptoms that resulted in return trips that resulted in admission. This information, published in Academic Emergency Medicine, could prove invaluable to clinicians working to fight a disease.