New Cases of PML on Tysabri Reported

Two new cases of the brain viral infection PML (progressive multifocal leukencephalopathy) have been reported on Tysabri treatment. One MS patient had been treated with Tysabri alone for 17 months without previous treatment with MS medications. This patient is still at home and walking. A second patient developed PML on Tysabri alone for 14 months, but had previous treatment with interferon and azathioprine. This second patient has cognitive problems and left-sided weakness and is currently hospitalized. If you are on Tysabri, contact your neurologist or healthcare provider to make a decision whether to continue therapy.