Table 1 Analysis of SONIA neutralization test with samples characterized by VNT (N = 189).

From: Detection of neutralizing antibodies against multiple SARS-CoV-2 strains in dried blood spots using cell-free PCR

NAb titer by VNT

Number of samples

Positive by SONIA test

Average SONIA test signals

SD of SONIA test signals

Agreement

Pre-COVID

43

0

0.07

0.22

100%

80

32

31

3.44

1.34

97%

160

34

34

4.33

0.76

100%

320

37

37

4.83

0.91

100%

640

26

26

5.10

0.96

100%

1280

14

14

4.98

0.93

100%

2560

3

3

6.15

0.26

100%

  1. Patient specimens were tested by SONIA and viral neutralization test (VNT). The concordance between the two methods was analyzed.
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