Tapeworm infection is due to by ingesting food or water tapeworm eggs or larvae.
If you ingest bound flatworm eggs, they'll migrate outside your intestines and type larval cysts in body tissues and organs (invasive infection).
If you ingest tapeworm larvae, however, they become adult tapeworms in your intestines (intestinal infection). An adult flatworm consists of a head, neck and chain of segments known as proglottids.
When you have an enteral infection, the flatworm head adheres to the enteral wall, and therefore the proglottids grow and manufacture eggs. Adult tapeworms will live for up to thirty years in a very host.