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.
Infection with the Japanese broad tapeworm was known to be contracted by eating salmon and was considered to be infection with D. latum until 1986, when Yamane et al. revised the identification of the Japanese broad tapeworm and established the new species D. nihonkaiense. Both tapeworms exploit freshwater copepods as their first intermediate host.
The extrapolated prevalence in Japan, is found to be 16,032 for two times of 8,164,762 population estimation used. 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.