A 15-year-old British boy has developed a potential test for Alzheimer's disease that could allow the condition to be diagnosed 10 years before the first symptoms appear. Currently, Alzheimer's can only be detected through cognitive tests or by looking at the brain after death.But Krtin Nithiyanandam, of Epsom, Surrey, has developed a "Trojan horse" antibody which can penetrate the brain and attach itself to the toxic proteins present in the disease's early stages.The antibodies, injected into the blood, are also attached to fluorescent particles which can then be picked up on a scan.Krtin submitted his test to the Google Science Fair Prize and learnt that he had made it to the final last week. He will find out next month if he has won a scholarship to take his idea further."The main benefits of my test are that it could be used to diagnose Alzheimer's disease before symptoms start to show by focusing on pathophysiological changes, some of which can occur a decade before symptoms are prevalent," Krtin said."Due to the conjugated fluorescent nanoparticles, my diagnostic probe can be used to image Alzheimer's disease non-invasively," he said. ..