Tapeworm infection is caused by ingesting food or water contaminated with tapeworm eggs or larvae. If you ingest certain tapeworm eggs, they can migrate outside your intestines and form larval cysts in body tissues and organs (invasive infection). If you ingest tapeworm larvae, however, they develop into adult tapeworms in your intestines.
The most common tapeworms to infect humans in Western Europe and USA/Canada are: Taenia solium - the pork tapeworm. Also known as the armed tapeworm or measly tapeworm. Taenia saginata - the beef tapeworm. Also called the unarmed tapeworm.Hemynolepis nana - the dwarf tapeworm. Adult tapeworm infections are treated with anthelmintic medication which is kills parasitic worms and makes the worms pass out of your intestine in your stools.