What type can parasites can I get from eating undercooked bison?

Not likely. If farm raised and not just captured from yellowstone, then the risk of parasites would be no higher than the risk for under cooked beef.
One possibility. Taenia saginata (beef tapeworm) may be one of the parasites in undercooked bison. http://www.ncbi.nlm.nih.gov/pubmedhealth/pmh0002366/.