Check these links for more information on immune system therapy.
CNN - HIV therapy may rebuild immune system - September 30, 1997
MedlinePlus - Aging changes in organs - tissue - cells
MedlinePlus - Aging Changes in Immunity
MedlinePlus - Immunodeficiency Disorders Treatment
MedlinePlus Immune System Article ... good link...look under "Treatment" for "Passive immunity (administration of antibodies produced by another person or animal) may occasionally be recommended to prevent illness after exposure to a microorganism."
NCRR�s Clinical Research - Thymus Transplants Help Rebuild the Immune System
Dr. Hulda Clark on AIDS and HIV
JAMA HIV-AIDS Information Center - The Thymus and Immunologic Reconstitution
JAMA HIV-AIDS Information Center - Commentary - Changes in Thymic Function With Age and During the Treatment of HIV Infection
Daniel C. Douek et al
The Anatomy of the Immune System
AMA (Comm) New Cancer Therapy Populates Immune System With Cancer-Fighting Cells
Mercy Medical Center - Herpes Simplex Virus
Researchers at UT Southwestern Medical Center at Dallas discover thymus gland plays role in fighting infection after bone-marrow transplantation.