This page collects vetted references on medical safety, regulatory guidance, and clinical background for anyone researching this topic.
Does Tysabri cause Progressive Multifocal Leukoencephalopathy?: Key Facts & Context
In-depth context and analysis on this topic for researchers and advocates.
Reference: World Health Organization (WHO)
Authoritative source for clinical, regulatory, and public-health background reading.
Reference: Centers for Disease Control and Prevention (CDC)
Authoritative source for clinical, regulatory, and public-health background reading.