The simple blood test could give early warning within three years The test could speed the search for new drugs that delay or prevent disease Experts are pleased, but it could bring health concerns if no cure is found A simple blood test has been developed that gives healthy elderly people precious early warning they may get Alzheimer’s within the next three years. It is hoped the test, the first to predict accurately who will become ill, could speed the search for new drugs that can delay or even prevent the devastating brain disease. It could eventually lead to widespread...