In a retrospective, single-center study, researchers retested 117 discharged COVID-19 patients from China for SARS-CoV-2 RNA using real time reverse transcriptase polymerase chain reaction (RT-PCR). Twelve out of 117 of these patients retested as positive for the virus, so the researchers investigated differences between patients who retested positive and negative. It was found that when compared to patients who retested as negative, patients who retested as positive had longer hospital stays, more comorbidities, a higher proportion of lymphocytopenia, and a higher proportion of either receiving glucocorticoids treatment or antibiotic treatment. Upon conducting a multivariable regression, there were higher odds of retesting as positive for SARS-CoV-2 if patients had a longer hospital stay or had lymphocytopenia upon being admitted into the hospital.