1. From Department of Medicine (N.M.G., P.S.G., I.C., J.A.A., W.L.S., A.D.W., A.J.L., J.A.B.), Department of Pathology (N.M.G., J.A.B.), and Department of Microbiology, Immunology, and Molecular Genetics (P.S.G., M.J.C., A.J.L.), University of California, Los Angeles, Calif.