Figure 1From: Neutralizing antibodies explain the poor clinical response to Interferon beta in a small proportion of patients with Multiple Sclerosis: a retrospective study Timeline of the study. The blood sample to test for the presence of NAbs was taken once during the study, at least 12 months after starting IFNβ treatment. Relapses or EDSS progression occurred in the first 6 months of therapy were not counted.Back to article page