Clinical Parasitology
Chapter 10: The Cestodes
Quick Quiz & Test Your Knowledge!
10-1. The cestode morphologic form characterized by 10-8. The infective stage of H. diminuta for humans is
a segmented appearance that houses male and female which of the following? (Objective 10-5)
reproductive structures is referred to as a(an): A. Rhabditiform larva
(Objective 10-1) B. Cysticeroid larva
A. Scolex C. Embryonated egg
B. Proglottid D. Encysted form
C. Egg
D. Cyst 10-9. Prevention and control measures against H.
diminuta include all except which of the following?
10-2. Characteristics of the cestodes include all the (Objective 10-7B)
following except: (Objective 10-9) A. Vaccination program
A. They are hermaphroditic. B. Effective rodent control
B. They generally require intermediate host(s). C. Inspection of food prior to consumption
C. Their laboratory diagnosis consists of finding larvae D. Protection of food from rodents
in feces.
D. Their anatomic regions include the scolex, neck, 10-10. A primary differential feature between an H.
and strobila. nana egg and H. diminuta egg is which of the
following? (Objective 10-9)
10-3. A persistent cough, localized pain, and liver and A. A flattened side for H. diminuta egg
lung involvement are associated with an infection B. A thick shell for H. nana egg
with which of the following cestodes? (Objective 10-6) C. Polar filaments in H. nana egg
A. Diphyllobothrium latum D. Radial striations in H. diminuta egg
B. Echinococcus granulosus
C. Both A and B 10-11. The characteristic of the life cycle of H. nana
D. Neither A nor B that differentiates it from the other cestodes is which
of the following? (Objective 10-9)
10-4. Which of the following are key distinguishing A. Lack of an intermediate host.
factors in differentiating an infection between T. B. Infective larval stage.
saginata and T. solium? (Objective 10-9) C. Need for external environment
A. Egg morphology and number of uterine branches D. Larval passage through the lungs
in proglottid
B. Presence of hooklets on scolex and egg 10-12. Which of the following does not apply to H.
morphology nana? (Objectives 10-3, 10-6, 10-7A, 10-7B)
C. Presence of hooklets and number of uterine A. Dwarf tapeworm
branches in proglottid B. Steatorrhea
D. Egg morphology and presence of suckers on C. Proper hygiene and sanitation procedures
scolex D. Praziquantel therapy
10-5. The primary means of developing an intestinal 10-13. A unique characteristic of Dipylidium caninum is
infection with Taenia spp. is via which of the which of the following? (Objective 10-10A)
following? (Objective 10-5) A. Lack of suckers on the scolex
A. Skin penetration of larvae B. Formation of egg packets
B. Ingestion of raw or poorly cooked meat C. Proglottid resemblance to Taenia solium
C. Egg consumption D. Alternation of female and male proglottids
D. Drinking contaminated water
10-14. A 2-year-old girl and her pet dog were
10-6. Which is the preferred drug for treating diagnosed with D. caninum infection. This infection
intestinal infection by Taenia spp.? (Objective 10-7) was acquired by which of the following? (Objective
A. Praziquantel 10-5)
B. Penicillin A. Ingestion of the parasite’s egg
C. Nicolasamide B. Penetration of soil larva
D. Pentamidine C. Ingestion of a flea
D. Consumption of poorly cooked beef
10-7. Which of the following is characteristic of an H.
diminuta egg? (Objective 10-10A) 10-15. Prevention and control measures to prevent D.
A. Spherical, with radial striations caninum infection include all except which of the
B. Ellipsoid, with terminal polar plugs following? (Objective 10-7B)
C. Oval, with thin shell and polar filaments A. Treat dog and cat pets to prevent fleas.
D. Oval, with polar thickenings and no filaments B. Warn children against dog and cat licks.
C. Deworm dog and cat pets, as needed.
D. Neuter dog and cat pets.
Clinical Parasitology
Chapter 10: The Cestodes
Quick Quiz & Test Your Knowledge!
10-16. The egg of D. latum is unique among the ____ 7. Acquired from animals G. Strobila
cestodes in that it contains which of the following? ____ 8. Hexacanth embryo H. Proglottid
(Objective 10-10A) ____ 9. Head of a tapeworm I. Coracidium
A. An operculum and terminal knob ____ 10. Larval form of Taenia spp. J. Sparaganosis
B. Radial striations and oncosphere
C. An operculum and lateral spine 10-2. State the common name of each of the following
D. A ciliated rhabditiform larva cestodes. (Objective 10-3)
A. Taenia saginata
10-17. Which of the following associations is correct B. Dipylidium caninum
for D. latum? (Objective 10-5) C. Hymenolepis nana
A. Snail-coracidium D. Diphyllobothrium latum
B. Copepod-procercoid E. Taenia solium
C. Fish-cysticercus F. Echinococcus granulosus
D. Beetle-pleurocercoid G. Hymenolepis diminuta
10-18. The primary pathology associated with a D. 10-3. In what parts of the world is Diphyllobothrium
latum infection is which of the following? (Objective latum endemic? (Objective 10-2)
10-6)
A. Eosinophilic pneumonitis 10-4. Specify the infective stage name for each of the
B. Vitamin D deficiency cestodes listed in question 10-2. (Objective 10-5)
C. Vitamin B12 deficiency
D. Fat malabsorption 10-5. What is the pathology most commonly
associated with each of the following? (Objective 10-6)
10-19. Which of the following procedures would not be A. Diphyllobothrium latum
appropriate for diagnosing an infection with B. Echinococcus granulosus
Echinococcus granulosus? (Objective 10-8)
A. Serologic procedure, such as ELISA 10-6. What is the specimen of choice for the laboratory
B. O&P examination of stool specimen diagnosis of each cestode listed in question 10-2?
C. CT scan of suspect organ (Objective 10-8)
D. Biopsy of cyst
10-7. Describe the appearance of the scolex of the
10-20. In humans, Echinococcus granulosus infection cestodes listed in question 10-2. (Objective 10-9).
results in which of the following? (Objective 10-5)
A. Eggs similar to those of H. nana 10-8. Differentiate the proglottids of Taenia saginata
B. A nutritional deficiency and Taenia solium. (Objective 10-9).
C. A hydatid cyst
D. Filariform larva 10-9. A 30-year-old recent immigrant from Mexico,
living in Colorado, presented to the Hispanic Health
10-21. Which of the following is not a usual site for Clinic after experiencing a seizure at his worksite His
Echinococcus granulosus infection in humans? history revealed numerous headaches for several
(Objective 10-8) weeks. The basic neurologic examination was normal;
A. Brain however, fearing a malignancy, the physician ordered
B. Liver a CT scan. Calcified lesions were noted. A biopsy
C. Lung revealed a parasitic infection. What organism is
D. Genitalia suspected? (Objective 10-11A)
10-10. A 55-year-old man and his family had returned
to the United States after a visit to his native Finland.
10-1. Match each of the key terms (column A) with the While there, he enjoyed fishing and cooking the fish
corresponding definition (column B). (Objective 10-1) over an open fire. After his return, he visited his
physician with complaints of diarrhea, abdominal
Column A Column B pain, and some cramping. Bacterial culture of a stool
____ 1. Smaller cyst within a A. Hermaphroditic specimen was negative for enteric pathogens.
hydatid cyst However, the microscopic O&P examination revealed
____ 2. Series of proglottids B. Scolex several large, oval, operculated eggs. With this brief
____ 3. Contains both male and C. Zoonotic history, which tapeworm is suspected? (Objective
female organs 10-11A)
____ 4. Develops from a procercoid D. Oncosphere
larva
____ 5. Segment of a tapeworm E. Cysticerus
____ 6. Free-swimming larva of D. F. Brood capsule
latum
