I called Active Source this morning. In answer to my question in the near future they will have info as to how many have been on Ty for 3 yrs. As of June '09 10,000 have been on it for at least 24mths-as far as I remember there are 8 pml cases-most in Europe-this is still below 1/1000. As Riverwild posted we will be able to updated by our Drs as to pml cases.
I have had 36 infusions and am very thankful for Tysabri
Linda