Background & Sources: Tysabri linked to Progressive Multifocal Leukoencephalopathy

An organized set of primary and secondary sources covering clinical background, drug-safety signals, and patient-safety considerations.

In-depth resource

Tysabri linked to Progressive Multifocal Leukoencephalopathy — Background & Analysis — detailed background and analysis.

World Health Organization (WHO)

Reference: World Health Organization (WHO)

Authoritative source for clinical, regulatory, and public-health background reading.

ClinicalTrials.gov

Reference: ClinicalTrials.gov

Authoritative source for clinical, regulatory, and public-health background reading.