It may be possible to reverse type 1 diabetes by training a patient's own immune system to stop attacking their body, an early trial suggests. Their immune system destroys the cells that make insulin, the hormone needed to control blood sugar levels. A study in 80 patients, published in the journal Science Translational Medicine, showed a vaccine could retrain their immune system. Experts described the results as a "significant step". Normally a vaccine teaches the immune system to attack bacteria or viruses that cause disease, such as the polio virus. Researchers at the Stanford University Medical Centre used a vaccine...