I get the need to try and find a cure. I find it really implausible one doctor would be able to perform complex neurosurgery, extract the cordyceps growth and preserve it, have the technical wherewithal to isolate the exact chemical neurotransmitters/enzymes, properly analyze them and then replicate them on a large enough scale to save humanity. Especially, given the fact that he was worried they wouldn't have enough power for the operation itself.
It brings up a lot of interesting thoughts about how interdependent we are, as a species. Advances in technology and modern medicine, manufacturing, food production- all things we take for granted in daily life- really depend on the contributions of a huge cohort of individuals, all working together. I don't know that production of a "cure" for the infection is plausible, at all, without access to Surgeons, Lab scientists, geneticists, technical equipment manufacturers, electronic maintenance people, computer programmers and IT infrastructure, plant maintenance people. It's staggering to think of the scope of work involved, and just how fragile that connection is. We truly stand on the shoulders of giants, just enjoying modern life.