An idea

It occurred to me that since the MS cure is actually a well understood chemotherapy used for leukemia patients, oncologists who treat leukemia would understand the risks vis-a-vis something like the JC virus/PML. Do oncologists check for that? Do their patients develop PML?

So I've asked my neurologist and our doctor friend Helen these questions, and I'll see what answer I get back. Since I've never heard of leukemia patients dying of incurable brain infections (not that I necessarily would), I'm feeling better about that.