The parasite just needs to encyst at the wrong spot so a heavy load is not necessary but would definitely increase the chances of hitting the CNS.
What program are you in that your taking parasitology?[/quote]
Yes, but almost every verity of parasite seen in rabbits do not leave the gi tract. There are a few exceptions... But generally, in rabbits, a parasitic infection shows minimal signs and when it does the signs are typically weightloss, anorexia, bloody stools etc... Only three of the well studied parasites have been clinically known to effect the brain and or nerviuse system.
But if you are suspecting a parasite I'd look into a few.... Encephalitozoon cuniculi, Toxoplasmida gondii, and maybe Sarcocystis cuniculi.
Encephalitozoon cuniculi would be you best shot.... Other then the three i listed above it would be a very very very rare parasite with little research to have an effect the nerviuse system or GI tract. Not to say it couldn't be because rabbit are an exotic speicies that has little known about them.
I am taking this course through CSU school for vet med and front range vet tech science study department. It is a branchedstudy program.