They are the first known cases of transmitted Alzheimer’s disease, likely a scientific anomaly yet a finding that adds another wrinkle to ongoing arguments about what truly causes Alzheimer’s. “It raises questions about whether amyloid alone is able to cause problems,” said Marc Dhenain, an Alzheimer’s expert at the French research center CEA, who was not involved in the new study. The researchers noted that the presentation of iatrogenic CJD often differs from that of the more common sporadic cases, so it’s possible the transmitted Alzheimer’s cases would look somewhat distinct from typical cases.

Source: Scientists document first-ever transmitted Alzheimer’s cases, tied to no-longer-used medical procedure