I feel like these biologics/immunosuppresives cause things to surface that someone who doesn't take these meds don't usually have to worry about
. I was on all of those before (Remicade for 5 years, then Humira for 6 months without response, then Cimzia when that came out... which helped some, and now Tysabri... which is working like Remicade did when I didn't have antibodies built up against it). Tysabri carries the risk of getting PML, a rare brain disease that can kill you. It is 1 in 1000 chance. I am not concerned, as there is a blood test that I get done every 6 months to check my antibodies to this JC Virus to tell me if I have ever been exposed to it or not. Both times so far have been negative for it, so I am not nearly as concerned. The only way that I can end up with PML is if I had that JCV in my system.
Tysabri, however, doesn't cause the brain illness. It is just an effect of it... in that the immune system is compromised enough to where it allows the latent JCV activate. I strongly believe all the biologics carry a risk to allow things to reactivate that may be in our system, or allow us to catch weird illnesses. It is unfortunate, but I think that goes with the territory. I will remain on these as long as I can without getting weird effects... as my Crohn's really does respond to them. If something does come up, it would be upsetting, but I guess that is the risk we all take on these in that our immune systems can't fight like a healthy person.