Fig. 1
From: Clinical and epidemiologic characteristics of inconclusive results in SARS-CoV-2 RT-PCR assays
Probability curves of PCR results versus days after symptom onset for NP/OP swab specimens (A) and sputum samples (B) from confirmed COVID-19 cases. The black solid lines and shaded areas depict the estimated probabilities of positive RT-PCR results and their 95% confidence intervals; the colored solid lines depict the estimated positive rates for the 3 target genes (E, RdRP, and N) included in the Allplex kit. The horizontal dotted line indicates that more than 95% of the specimens were negative