Fish tapeworm infection
Medicines to fight the parasites are given in a single dose to treat the tapeworm infection. Vitamin B12 injections or supplements may be needed to treat megaloblastic anemia.
Fish tapeworms can be eradicated with a single treatment dose. There are no lasting effects.
Call your health care provider if you have noticed a worm or segments of a worm in the stool. Also call if any family members have symptoms suggestive of pernicious anemia.
Sampaio JLM, Andrade VP, Lucas MC, et al. Diphyllobothriasis. Emerg Infect Dis. 2005;11:1598-1600.