Submitted by art on Wed, 2008-07-23 07:46.
Tysabri has been back on the market for 2 years now. A whopping 17,800 people are taking it in the US, with 13,400 more world-wide. No new cases of confirmed PML have been seen, but only 6,600 people have been on Tysabri for more than 18 months.
So far, so good!