It’s the first time the snake parasite has been seen in a human, let alone a brain.
3 points
Because doctors are only human, and they’re doing the best they can with what tools they have and what they know. If someone comes in with all the symptoms of X disease, you’re going to treat them for X disease instead of straightaway concluding that they have a worm living in their brain that has never before been seen in humans and treating them with medicine we usually give to horses to get rid of parasites.