There are a few parasitologists but they are a joke. They are swindlers and will not help you.
If you are deathly ill and you are admitted into a hospital with a very high temp and they see parasites with their own eyes because they have tested for everything else, they will call in an infectious disease doctor, especially if you tell them you just got back from overseas (the ID docs do not "specialize" in parasitic infections but they may know more than most).