Collection of Convalescent SARS Plasma by Apheresis

The purpose of this study is to collect plasma by apheresis from patients who have recovered from Severe Acute Respiratory Syndrome (SARS). This plasma will be processed into a SARS-antibody enriched intravenous immune globulin (IVIG) product. This product will then be available for use in a clinical trial if a SARS epidemic recurs. Potentially eligible participants are people between 18 and 56 years of age who have recovered from SARS. Potential participants will undergo three sequential screenings to determine their eligibility for this study. Eligible participants will then be scheduled for plasmapheresis. After apheresis, additional testing will be performed on a sample of the source plasma. Once the sample has been tested and cleared, the source plasma will be shipped to the United States to the storage facility and finally to the site of manufacturing of the IVIG product. Participants may donate plasma again after 14 days. The study will not have a direct benefit for participants. However, participation may help develop a treatment that could be useful to other people who become infected with SARS.