A thoroughly sleazy article, obviously intended to spread fear.
Notice the word "if" in the following quote from the article. The statement makes sense if the drug has a KNOWN risk of death. The obvious intention with this statement is to imply that Tysabri carries a KNOWN risk of death, which is not true. Sleazeballs personified!
"Langer-Gould and Steinman argue that if a drug has a known risk of death, it should only be used on patients who are likely to suffer severe disability from the targeted disease -- and for whom there are no other options. "