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News
Alzheimer's isn't contagious, but rare medical procedures may have seeded it. A 2026 autopsy-confirmed case of a cadaveric growth hormone recipient who developed full Alzheimer's neuropathology has strengthened — though not settled — the case for iatrogenic transmission. Experts say routine surgery and blood transfusions don't carry a demonstrated risk, and patients should be reassured rather than alarmed.
Alzheimer's disease (AD) can't be caught through everyday contact — but a growing body of evidence suggests that, in rare cases, the amyloid-beta pathology underlying AD may have been transmitted through certain historical medical procedures. The strongest evidence involves cadaveric human growth hormone (c-hGH), used in thousands of children before being discontinued in 1985, and cadaveric dura mater grafts used in neurosurgery. A landmark 2026 case report in JAMA Neurology described the first autopsy-confirmed AD case in a c-hGH recipient — a man who developed dementia at 47 and died at 57, with no genetic explanation and extensive amyloid and tau pathology at autopsy.
A separate Lancet Viewpoint raised the possibility that blood transfusions could also transmit amyloid-beta seeds, citing a Scandinavian study of over 1 million transfusion recipients. However, experts caution that the transfusion evidence remains indirect and speculative, and a second large Scandinavian study found no increased AD risk from receiving blood from donors who later developed AD.
Key Takeaways:
Why it matters: While these cases are extraordinarily rare and tied to largely discontinued practices, the findings are reshaping how scientists think about AD's origins and transmission. International registries are now tracking iatrogenic CAA cases globally, and researchers are calling for urgent studies on blood product safety — with implications for public health policy around blood donation and surgical instrument sterilization.
