  
The
Beef tapeworm is common in Mexico, South America, Eastern
Europe,Middle East, and Africa.
Pork
tapeworm is common in South America, Asia, Africa, and Eastern
Europe.
Fish
tapeworm occurs worldwide. The infected fish has infective
cysts in its flesh. If inadequately cooked, they enter the
gut.
Beef tapeworms are acquired from beef and can be up to 10
cm long. They may cause vague abdominal symptoms with diarrhea,
vomiting, and weight loss.
Sometimes
they can also cause physical obstruction.
Pork
tapeworms cause similar symptoms as beef tapeworms when the
larvae are eaten, but different diseases are caused. Pork
tapeworm eggs are ingested. Hatching larvae will invade the
gut and get into the bloodstream, acting like trichinosis.
This
disease, human cysticerosis may not be apparent for years
but there cysts can be present in the brain, eye, and skin.
Fish
tapeworm usually causes only mild symptoms but can interfere
with the body's absorption of vitamin B12 causing pernicious
anemia. Diagnosis of tapeworm is by stool analysis.
Tapeworms links
CDC http://www.dpd.cdc.gov/dpdx/HTML/Taeniasis.asp?body=
Frames/S-Z/Taeniasis/body_Taeniasis_page1.htm
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