Tysabri And PML.
 

Check out ehealthline.com for more info on Tysabri and PML incidents.
A rather newish site with great info.

On Jan, 2, 2014: 90,291 people reported to have side effects when taking
Tysabri. Among them, 2,583 people (2.86%) have Progressive Multifocal
Leukoencephalopathy. Higher than reported by Biogen.

http://www.ehealthme.com/ds/tysabri/...encephalopathy

Also... https://www.facebook.com/notes/ccsvi...51730298782211

I wouldn't trust any numbers Biogen reports as far as PML occurrence while on Ty. :rolleyes:

To me, this is petrifying. :eek: