I was hoping for a happy ending where they took Ellies blood, got the antibodies and were able to keep creating a vaccine. What's the science behind cracking her head and cutting up her brain?
Some additional info on this big ass apoiler:
the blood-brain barrier isolates the circulatory system inside the brain from the rest of the body and even the immune system is kept mostly out (which is why brain infections are so damn dangerous). Whatever stopped the infection from spreading is not present in the blood outside the brain. Of course, the BBB also makes the entire fungal brain infection a bit more implausible since spores are usually gigantic compared to the stuff that's allowed through the barrier.