Cestodes: Taenia & Other Worms

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Questions and Answers

What is the common name for Taenia saginata?

  • Pork Tapeworm
  • Dog Tapeworm
  • Beef Tapeworm (correct)
  • Fish Tapeworm

Which of the following is a characteristic of cestodes?

  • Segmented body (correct)
  • Alimentary canal present
  • Body cavity present
  • Separate sexes

What is the 'head' of an adult worm more commonly referred to as?

  • Strobila
  • Scolex (correct)
  • Proglottid
  • Cysticercoid

Which of the following cestodes has larvae that can develop in humans?

<p>Echinococcus granulosus (D)</p> Signup and view all the answers

Which of the following is the intermediate host of Taenia solium?

<p>Pigs (A)</p> Signup and view all the answers

In Dipylidium caninum, what is the intermediate host?

<p>Fleas (B)</p> Signup and view all the answers

Which cestode can complete its life cycle in a single host?

<p>Hymenolepis nana (C)</p> Signup and view all the answers

What is a characteristic of Pseudophyllidean cestodes?

<p>False or slit-like grooves called bothria (D)</p> Signup and view all the answers

What is the adult stage of Diphyllobothrium latum found?

<p>Intestine (A)</p> Signup and view all the answers

What is the first larval stage of Order Pseudophyllidea called?

<p>Procercoid (C)</p> Signup and view all the answers

What type of eggs do Pseudophyllidean cestodes produce?

<p>Operculated (A)</p> Signup and view all the answers

How many suckers does a Cyclophyllidean cestode contain?

<p>Four (C)</p> Signup and view all the answers

Gravid proglottids of Taenia saginata contains how many ova (eggs)?

<p>97,000 to 124,000 (C)</p> Signup and view all the answers

Which of the following is a treatment for Taenia saginata?

<p>Praziquantel (D)</p> Signup and view all the answers

Which of the following symptoms is associated with Taenia saginata?

<p>Hunger pangs (B)</p> Signup and view all the answers

How are eggs released from Taenia saginata?

<p>By rupture of ripe proglottids (B)</p> Signup and view all the answers

Which of the following is commonly associated with Taenia solium?

<p>Measly pork (C)</p> Signup and view all the answers

What feature does the scolex of Taenia solium have?

<p>Rostellum with hooklets (B)</p> Signup and view all the answers

Proglottids of Taenia solium are expelled in what manner?

<p>Passively in chains (D)</p> Signup and view all the answers

In Taenia solium infections, what is the result of proglottids not being as motile as Taenia saginata?

<p>L Lower likelihood of intestinal obstruction (C)</p> Signup and view all the answers

How is Taenia solium diagnosed?

<p>Stool examination (D)</p> Signup and view all the answers

What is the adult form of Echinococcus granulosus usually found?

<p>Dogs (B)</p> Signup and view all the answers

How many segments does Echinococcus granulosus possess?

<p>3-4 (D)</p> Signup and view all the answers

Which of the following animals can be infected and transmit Echinococcus granulosus?

<p>Dogs (B)</p> Signup and view all the answers

What is the most common site of involvement for Echinococcus granulosus?

<p>Liver (D)</p> Signup and view all the answers

The genus Hymenolepis is derived from what characteristic?

<p>The membranous character of the egg shell (B)</p> Signup and view all the answers

Which of the following is another name for Hymenolepis nana?

<p>Dwarf Tapeworm (C)</p> Signup and view all the answers

How many testes does Hymenolepis nana have in each mature segment?

<p>3 (C)</p> Signup and view all the answers

Which of the following is a distinctive feature of hymenolepis eggs?

<p>May contain polar filaments (D)</p> Signup and view all the answers

Where are Hymenolepis nana adult worms found?

<p>Ileum (B)</p> Signup and view all the answers

Which of the following is a mode of transmission of Hymenolepis nana?

<p>Ingestion of eggs (D)</p> Signup and view all the answers

How is Hymenolepis nana infections best diagnosed?

<p>Identifying eggs in stool (A)</p> Signup and view all the answers

Why is the drug dosage higher for Hymenolepis infections versus Taeniasis?

<p>Resistant cysticercoids in intestinal tissue (D)</p> Signup and view all the answers

What is the intermediate host of Hymenolepis diminuta?

<p>Fleas (D)</p> Signup and view all the answers

Which is than Hymenolepis nana?

<p>Larger (C)</p> Signup and view all the answers

How is Hymenolepis diminuta transmitted?

<p>Ingestion of infected arthropods (C)</p> Signup and view all the answers

True or False: A scolex contains an armed rostellum.

<p>False (A)</p> Signup and view all the answers

A common name for Dipylidium caninum is what?

<p>Double pored dog tapeworm (C)</p> Signup and view all the answers

In Dipylidium caninum, bilateral genital pores are present. What does 'di; pylis:' mean?

<p>Two; Gate (C)</p> Signup and view all the answers

What encapsulates capsules in Dipylidium caninum?

<p>An embryonic membrane (D)</p> Signup and view all the answers

Flashcards

Tapeworms

Long, segmented, tape-like worms.

Scolex

The anterior end of a tapeworm, used for attachment.

Strobila

Body region of a tapeworm, consisting of segments called proglottids.

Proglottids

Segments that make up the strobila of a tapeworm.

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Bothria

False or slit-like grooves on Pseudophyllidean cestodes for attachment.

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Acetabula

Cup-like and round suckers on Cyclophyllidean cestodes for attachment.

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Diphyllobothrium latum

A fish tapeworm with bothria and adult worms in the intestine

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Procercoid

First larval stage of Pseudophyllidean cestodes.

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Plerocercoid

Second larval stage of Pseudophyllidean cestodes.

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Pseudophyllidea Characteristics

Head has two slit-like sucking grooves called bothria.

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Fish/Broad Tapeworm

A common name for Diphyllobothrium latum

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Diphyllobothrium latum Ova

Inconspicuous operculum at one end and a small knob at the other end.

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Diphyllobothrium latum Mode of Infection

Humans get from eating raw/undercooked, infected fish or roe containing plerocercoid larva.

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Taenia saginata

A beef tapeworm that possess no rostellum and hooks.

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Taenia saginata

An unarmed tapeworm from man.

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Gravid proglottid of Taenia saginata

Uterus has 15-30 branches on each side.

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Taenia saginata Mode of Infection

Beef containing Cysticercus bovis

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Diagnosis of Taenia saginata

Identifying eggs, proglottids or scolex

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Treatment to cure Taenia saginata

Using Praziquantel

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Taenia solium

The pork tapeworm.

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Taenia solium

An armed tapeworm of man.

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Taenia solium Mode of Infection

Taeniasis is common among those eating raw or insufficiently cooked measly pork

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Scolex of Taenia solium

Scolex with 4 circular suckers and rostellum with alternating large and small hooklets.

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Taenia solium Ova

Eggs that are same as those of Taenia saginata.

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Contracting Taenia solium

Mode of infection by eating measly pork containing Cysticercus cellulosae

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Cysticercosis of Taenia solium

A multiple amount in the organ and tissues

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Echinococcus granulosus

Taenia echinococcus

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Larva of Echinococcus granulosus

Represent the structure of the scolex of future adult worm.

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Echinococcus granulosus Infective To

Man, Cattle, Sheep and other herbivorous animals

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Definitive Hosts of Echinococcus granulosus

Dog, Wolf, Fox and Jackal.

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Treating Echinococcus granulosus

Surgical resection and solicidal agent or PAIR technique.

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Hymenolepis nana

A parasitic worm that infects the ileum, causing dwarf tapeworm infection; smaller strobilas; 25mm to 45mm and only human tapeworm

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Direct Mode of Transmission

Hosts that ingest eggs which hatch in the duodenum.

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Indirect Pathway if Hymenolepis nana

Hosts ingestion via rice and stool beetles.

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Diagnosing Hymenolepis nana

Demonstration of characteristic ova in the stool

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Hymenolepis diminuta

A rat tapeworm with accidental human infections different from other tapeworm; larger, over 4 inches

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Hymenolepis diminuta

Through ingestion of cysticerci intermediate hosts like rice floor and stool beetles

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Dipylidium caninum

Dipylidiasis is a common intestinal parasite in pets.

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Intermediate hosts of Dipylidium caninum

Through host ingestion through Ctenocephalides canis, Ctenocephalidies felis, Pulex irritnans and Trichoedectes canis.

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