Heart disease and stroke are the world's biggest killers. Millions of people in Britain take cholesterol-lowering drugs to reduce their risk. Now scientists from the Netherlands Organisation of Applied Scientific Research believe they may have found an alternative treatment. It's a vaccine that helps the body's immune system get rid of bad cholesterol from the blood. The first human trials are now under way, but researchers say it will take six years before they know if the jab is safe and effective enough to get regulatory approval.

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