Department of Pediatric Infectious Diseases and Pediatrics; Children's National Medical Center; Washington, DC (WJR)
Inova Hospital for Children; Falls Church, VA (RHS)
Accepted for publication July 13, 1999.
Presented in part at the Annual Meeting of the Pediatric Societies, New Orleans, May, 1998.
Address for reprints: William J. Rodriguez, M.D., Ph.D., Children's National Medical Center, Infectious Disease Department, 111 Michigan Avenue, N.W., Washington, DC 20010. Fax 202-884-3850; E-mail firstname.lastname@example.org.