 Peripheral blood mononuclear cells are collected at baseline and periodically during and after treatment to assess viremia. Throat gargle and urine specimens are assessed periodically during course 1 for viral shedding by reverse transcriptase-polymerase chain reaction RT-PCR. Peritoneal aspirate is tested at baseline and periodically during treatment for viral replication by RT-PCR, co-culture with Vero cells, and measles virus N-specific mRNA in situ hybridization. 