This page collects vetted references on medical safety, regulatory guidance, and clinical background for anyone researching this topic.
Does Tysabri cause Progressive Multifocal Leukoencephalopathy Resource Guide
A focused review of background, context, and source material on this subject.
Reference: ClinicalTrials.gov
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.
Reference: MedlinePlus — Trusted Health Information
Authoritative source for clinical, regulatory, and public-health background reading.