Curious as to whether other Tysabri patients have had to recently give blood samples?

Would be interesting relative to comments Elan recently made on their conference call - that they are coordinating information they have learned regarding JC virus and PML with scientific experts to ensure robustness. Talked about potential individual risk factors such as level of JC virus antibodies, JC virus genotype, length of prior immunnosuppressive treatment, and duration of Tysabri treatment.