Figure 2个  Table 1个
    • Multiple dilution Undiluted
      (25 µL)      		 System A
      (30–50 µL)      		 System B
      (25 µL)
      0 2 4 5 6 2 3
      System (µL)
      Mix + RNA      		 20 + 5 20 + 10 20 + 20 20 + 25 20 + 30 15 + 10 10 + 15
      Positive rate (%) 100 100 100 100 96 100 100
      Mix Premixture, RNA SARS-CoV-2 nucleic acid extraction.

      Table 1.  Two qRT-PCR systems.