This page collects vetted references on medical safety, regulatory guidance, and clinical background for anyone researching this topic.
Tysabri linked to Progressive Multifocal Leukoencephalopathy Resource Guide — detailed background and analysis.
Reference: MedlinePlus — Trusted Health Information
Authoritative source for clinical, regulatory, and public-health background reading.
Reference: European Medicines Agency (EMA)
Authoritative source for clinical, regulatory, and public-health background reading.
Reference: World Health Organization (WHO)
Authoritative source for clinical, regulatory, and public-health background reading.