1. From the Cardiovascular Research Institute, MedStar Research Institute, Washington Hospital Center, Washington, DC (E.S., M.S.B., C.W., T.K., J.M.M., M.S., S.E.E., S.F.); the Department of Neuroscience, Georgetown University, Washington, DC (A.B.); and the Mucosal Immunity Section, Laboratory of Clinical Investigation, NIAID, NIH, Bethesda, Md (A.l.S.).