PROTOCOL OUTLINE: This is a double blind, randomized, controlled study. Patients receive either intravenous human immune globulin (IVIG) or placebo infused at a rate of 40 mL/hr, increasing every 30 min to a maximum of 100 mL/hr daily over 6 to 8 hours for 2 days. On day 2, infusions of IVIG or placebo are delivered at the highest dose tolerated on day 1.