Clinical and laboratory analyses.
Nasopharyngeal swab samples were collected on days 1, 3, 5, and 7 either in the clinic or by mobile nursing, and virology assays were performed by Viroclinics Biosciences-DDL Diagnostic Laboratory (Rotterdam, Netherlands). SARS-CoV-2 viral load (RNA copies/mL) was measured by N1-gene RT-PCR as described by Lu et al. (