The AU values for six Abbott test negative subjects were above the pre-pandemic range for RBD-specific IgM and for N-specific IgA, and two Abbott test negative subjects have RBD-specific IgG above the pre-pandemic range (Figure 5C), Taken together, these iresults show clear serological evidence of infection in many of these Abbot test- subjects. The gene discussed is CD40LG; the disease is infection.