The project won top prize last week 500,000 euros ($530,000) at the Euro Health Innovation awards for Latin American medicine, sponsored by pharmaceutical firm Eurofarma.The vaccine works by triggering patients’ immune systems to produce antibodies that bind to cocaine molecules in the bloodstream, making them too large to pass into the brain’s mesolimbic system, or “reward center,” where the drug normally stimulates high levels of pleasure-inducing dopamine.