Researchers are edging closer towards a blood test that can detect Alzheimer’s disease even before symptoms appear. Photograph: Matthew Horwood/Getty

Researchers are edging closer towards a blood test that can detect Alzheimer’s disease even before symptoms appear. Scientists from the US and Europe(...)

Structure of the amyloid beta peptide   bound to the cell membrane. Scientists at Washington University  reported that they had devised the most sensitive blood test yet. Photograph: Getty Images/iStockphoto

For decades, researchers have sought a blood test for beta amyloid, the protein that is a hallmark of Alzheimer’s disease. Several groups and companie(...)