I just have a difficult time believing that millions of years of evolution would result in the brain producing a protein that causes AD. I find it easier to believe that Amyloid Beta is part of the brain's "immune response" to an unwelcome "invader". Detecting the precise nature of the infection by biopsy of the entire brain is probably not very helpful to the pt!!! Nevertheless, I suspect that research directed at identifying then treating actual infections is more likely to lead directly to an AD cure.