Have you read any good books lately? liberty tax refund anticipation loan Although more research is needed, Henrich said it’s possible the patients were able to suppress the HIV without drugs because of a bone marrow transplant complication called “graft-versus-host.” Although this complication usually has a negative connotation, it could mean that the donor stem cells in the bone marrow attacked the HIV patients’ remaining HIV-positive cells and replaced them with healthy ones.