Fig. 1. Percentage of detected antibodies reactive to S1 and S2 subunits (S1 + S2), and nucleocapsid from SARS-CoV-2 in human milk collected during the COVID-19 pandemic.

S1+S2-reactive a secretory IgM (SIgM)/IgM, b IgG and c secretory IgA (SIgA)/IgA in human milk from 41 women. Nucleocapsid-reactive d SIgM/IgM, e IgG and f SIgA/IgA. Milk expression period was from 30/02/20 to 03/04/20 in the United States.