Table 3 Detection of salivary antibody in household members.

From: Evaluation and deployment of isotype-specific salivary antibody assays for detecting previous SARS-CoV-2 infection in children and adults

Assay

PCR +ve cases (N = 36) n (%)

PCR –ve contacts (N = 31) n (%)

Spike IgA

23 (63.9%)

13 (41.9%)

Spike IgG

31 (86.1%)

18 (58.1%)

N-protein IgA

14 (38.9%)

11 (35.5%)

N-protein IgG

6 (16.7%)

2 (6.5%)

N-protein IgA or IgG

16 (44.4%)

13 (41.9%)

Spike IgA or IgG

34 (94.4%)

22 (71.0%)

Spike IgA or N-protein IgA

25 (69.4%)

15 (48.4%)

Spike IgG or N-protein IgG

32 (88.9%)

18 (58.1%)

Spike or N-protein, IgA or IgG

34 (94.4%)

22 (71.0%)

  1. The number and proportion (%) of PCR-confirmed cases (N = 36) and PCR negative contacts (N = 31) with antibody above thresholds for positivity on at least one occasion measured by N-protein and spike IgA and IgG assays.
Back to article page