Fig. 3

Comparative characterization of RT-qPCR efficiency and sensitivity. The same clinical specimen was used for all tests. a The S-gene amplicon (S) was compared with ORF E (E) in singleplex and duoplex reactions. b The direct performance comparison of ORF E (E) amplicons with ORF N (N) and RdRP (R) demonstrated the differences in sensitivity, whereby E>N>R