Fig. 2From: Persistence of SARS-CoV-2 RNA in the nasopharyngeal, blood, urine, and stool samples of patients with COVID-19: a hospital-based longitudinal studyThe duration for a positive SARS-CoV-2 RNA RT-PCR test to turn negative. a Nasopharyngeal RT-PCR (n = 100). b Blood RT-PCR (n = 24). c Stool RT-PCR test (n = 6). d Urine RT-PCR test (n = 7)Back to article page