Antibodies in the breastmilk of COVID-19 recovered women

Table 3 Anti-SARS-CoV-2 IgG and IgA antibody levels in breastmilk

Antibody	Study Group	Control Group	p value
IgG [BAU/ml]	0.366 ± 0.544	0.00	< 0.001
IgG [BAU/ml]	(0.25, 0.00-0.55)	0.00	< 0.001
number of samples below detection limit of an assay	28 (38.9%)	17 (100%)
IgG [ratio]	0.226 ± 0.283	0.014 ± 0.011	< 0.001
IgG [ratio]	(0.14, 0.06-0.32)	(0.01, 0.01-0.02)	< 0.001
IgA [ratio]	5.588 ± 2.906	1.029 ± 0.710	< 0.001
IgA [ratio]	(7.52, 2.68-8.00)	(0.99, 0.53-1.45)	< 0.001
number of samples above IgA assay range	31 (43.1%)	0 (0.0%)

Data are presented as mean ± SD (median, IQR). IgG level for samples below detection limit were assigned 0 BAU/ml. IgA level for samples exceeding assay range was assigned a ratio of 8. Breast milk was assayed 5-fold diluted

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