Health · Medical Research · 4 hrs ago
Stem cell donors can pass on some immune traits, but risks are assessed
A stem cell transplant replaces a patient’s blood-forming cells and immune system with those from a donor.
After the transplant, the donor’s blood and immune system take over, but the patient’s organs, including the brain, remain their own.
Allergies can rarely pass to the recipient, and individual cases of autoimmune disease transfer have been described; Alzheimer’s transfer has not been reported in people.
Doctors do not routinely test for genetic tendencies to disease because most cannot be predicted reliably.
Donors are questioned, examined and given blood tests, and people with some autoimmune diseases cannot register as donors.
The replacement immune system can also attack leukemia cells left in the patient, helping the transplant work as a treatment.
A donor may be a matched sibling or an unrelated volunteer, and transplants can also use partly matched family members or cord blood, so most people can find a donor.
Stem cell transplants can transfer some donor immune traits, but the risks are assessed before a donor is chosen.
Allergies can rarely transfer, while some recipients’ existing allergies disappear after transplantation.
Individual cases of autoimmune diseases transferring have been reported, and people with such diseases cannot register as donors.
Genetic predispositions are not routinely screened for because most cannot be reliably predicted.
The donor’s new immune system can help fight remaining leukemia cells, a major reason transplantation can be curative.
- Who
- Stem cell donors and recipients, and the transplant teams that assess donor suitability.
- What
- The discussion explains which immune traits may transfer through a stem cell transplant and how risks are assessed.
- When
- SRF published the Q&A on 12 October 2026.
- Where
- Not stated.
- Why
- The Q&A addresses whether donors can pass on disease predispositions and explains the risks and potential benefits of transplantation.
This story does not have two clearly opposing sides.
The donor undergoes a detailed interview, a medical examination and blood tests.
The donor’s blood and immune system take over in the recipient.
- Publication date
- 12 October 2026
- Allergy transfer
- Rarely reported
- Genetic predispositions
- Not routinely screened for
- Donor assessment
- Interview, medical examination and blood tests
- Transplant benefit
- The new immune system can attack remaining leukemia cells
What people are saying
After the transplantation, the blood and immune system come from the donor, with their individual traits.
Allergies can rarely transfer; more often, the recipient’s previous allergies disappear after transplantation.
The new immune system recognizes remaining leukemia cells as foreign and fights them.
Sources
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