A new European study finds that the supercharged vaccines used to fight the H1N1epidemic in 2009 may not have boosted the risk for a disease known as Guillain-Barre syndrome after all.Click here to find out more! Guillain-Barre is a rare disorder, which causes a person’s immune system to damage nerve cells, resulting in muscle weakness and even paralysis. In 1976, a vaccine used during a U.S. flu outbreak was linked to the disease, and the government halted vaccination. Debate has continued since then over whether vaccines in use could trigger the syndrome.