Under Goofs, this is listed:
" SSPE doesn't have a cure or stages. "
This is an odd statement, in that it would suggest that the disease is terminal or else otherwise that in reality, there's nothing that they could do - I.E. the disease would resolve itself: Either Dan would get better, or he would die. This, despite the fact that it states the following on the disease's own page:
" The disease must be treated soon after symptoms begin to appear, otherwise the course of the disease is terminal (similar to rabies). "
While treating a disease isn't always equivalent to curing it, how would the two not be one and the same in the case of SSPE? At the very least, saying the disease "doesn't have a cure or stages" is overly simplistic and warrants clarification.