Cestodes. Gregory L. Brower, D.V.M., Ph.D. Cell Biology and Anatomy School of Medicine Columbia, South Carolina. Cestodes (Tape Worms). Taenia solium (pork tapeworm) - Cysticercus Taenia saginata (beef tapeworm) Diphyllobothrium latum (fish tapeworm)
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Gregory L. Brower, D.V.M., Ph.D.
Cell Biology and Anatomy
School of Medicine
Columbia, South Carolina
note that the reproductive organs are just beginning to differentiate.
Developing reproductive organs
Tapeworms are Hermaphroditic
2-4 m long,
It is soybean-like in shape, with the small scolex invaginated into the translucent cyst (left).
The scolex evaginated from the cyst (right).
The eggs of Taenia saginata and T. Solium are morphologically indistinguishable.
History of eating undercooked beef or pork
Recovery of proglottids and/or eggs in the stool
Distributed worldwide: freshwater (great lakes)
abdominal discomfort, rarely severe cramping pain, diarrhea alternated by constipation, vomiting
related to worm burden
weight loss, vitamin B-12 deficiency
physical mass and inflammation
ova in the feces
Treatment and Control
Praziquantel is the drug of choice
rodent population control
progressively growing cyst
pulmonary abscess, cough, chest pain
Fever, pruritus, urticaria, anaphylactoid reactionsEchinococcus granulosus:Symptoms