Fig. 2. Trends of Ct values of three target genes when consecutive SARS-CoV-2 rRT-PCR tests were conducted with nasopharyngeal swab samples from two COVID-19 patients. (A) The asymptomatic patient without treatment (patient 3). (B) The patient with severe symptoms under extracorporeal membrane oxygenation and low-dose steroid treatments (patient 4). Red arrows indicated inconclusive results