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. 2021 Apr 21;6(2):e00224-21. doi: 10.1128/mSphere.00224-21

TABLE 5.

Results of SARS-CoV-2 spike-specific IgG→IgA tests

Sample cohort
(no. of samples)a
No. of samples with result
% positive
samples
% negative
samples
IgG IgA IgG+ IgA IgG IgA+ IgG+ IgA+
Conv (197) 15 44 2 136 92 8
Ctrl (155) 152 3 0 0 2 98
a

Samples analyzed at 1/1,000 and 1/200 serum dilutions for IgG and IgA, respectively.