(i) Levels of specific antibodies in CIP. The levels of specific IgG, IgM, and IgA to spike (S), receptor binding domain (RBD), and nucleocapsid (NC) were measured to determine the levels of each class of specific antibody in the CIP transfused (Table 2, Fig. S2, panel A, in the supplemental material). The gene discussed is CD40LG; the disease is hereditary sensory and autonomic neuropathy.