Original sentence: In one case, a 2006 petitioner successfully claimed that a hepatitis B vaccine caused her multiple sclerosis despite several studies showing that the vaccine neither causes nor worsens the disease, and despite a conclusion by the Institute of Medicine that evidence favors rejection of a causal relationship.This ruling granted an award even though no "peer reviewed" scientific evidence supported the petitioner's claim that tetanus vaccine caused a particular case of optic neuritis
Edited sentence: In the most extreme of these cases, a 2006 petitioner successfully claimed that a hepatitis B vaccine caused her multiple sclerosis despite several studies showing that the vaccine neither causes nor worsens the disease, and despite a conclusion by the Institute of Medicine that evidence favors rejection of a causal relationship.This ruling granted an award even though no scientific evidence supported the petitioner's claim that tetanus vaccine caused a particular case of optic neuritis