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Svenningsson and colleagues concluded that her death resulted from "rebound neuroinflammation as a result of the development of natalizumab anti-drug antibodies."

Noteworthy was that the patient had shown unusual reactions to the drug starting with the fourth infusion, including chills and fever, they suggested.

"We recommend that repeated moderate to severe infusion reactions in the beginning of natalizumab treatment should prompt the cessation of treatment and assessment for the development of natalizumab anti-drug antibodies," Svenningsson and colleagues wrote.