Study Drug Administration:
If you are found to be eligible to take part in this study, you will be admitted to the hospital. On the first day, before starting the hATG, a small amount of diluted hATG will be injected under your skin to make sure that you are not allergic to it. If you have a reaction, more testing may be done. If the reaction is severe, you will be taken off study.
On Days 1-4 you will receive methylprednisolone by vein over about 10 minutes. You will receive hATG by vein over 8 hours.