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Kaplan-Meier plots SARS-CoV-2 RT-PCR positivity by day from symptom onset in mild–moderate COVID-19. A, Kaplan-Meier survival curve with 95% CIs for positive upper respiratory tract SARS-CoV-2 RT-PCR by day from symptom onset. B, Kaplan-Meier survival curve by BMI category. Abbreviations: BMI, body mass index; COVID-19, coronavirus disease 2019; RT-PCR, reverse transcription polymerase chain reaction; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.
