Resetting the immune system can be already done and it seems to help against auto-immune diseases such as lupus, but it is very dangerous. Once you destroy the

Resetting the immune system can be already done and it seems to help against auto-immune diseases such as lupus, but it is very dangerous. Once you destroy the immune system of the patient, and before it grows back from donor cells, the patient is fatally vulnerable even to normally banal pathogens such as the common cold. Keeping the patient isolated and alive in a hospital full of germs is a major challenge. That is why this kind of therapy is only used when the patient faces death anyway.