1. From the Immunogenetics Division (A.M., N.S., G.F.S., M.G.-D.), Pediatrics Department; Cardiology Division (R.V.Z.D., D.R.A.), Medicine Department, Federal University of São Paulo, Brazil; and Ghost Lab (A.M., N.S., A.P.-D., P.M.); Laboratory of Cellular and Molecular Immunology; National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Md.