Table 2 Cutoff determination for three matrices.

From: N-protein presents early in blood, dried blood and saliva during asymptomatic and symptomatic SARS-CoV-2 infection

 

Serum/plasma

DBS

Saliva

Negative n

100

97

106

Positive n

40

21

29

Youden Index

0.89

3.05

0.88

fLoQ

1.25

3.91

1.25

Cutoff chosen

1.25

3.91

1.25

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