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Parasitology > Intestinal Cestodes > Flashcards

Intestinal Cestodes Flashcards

1
Q

Region of growth in cestodes

A

Neck

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2
Q

Body of the cestode

A

Strobila

  • Proglottids - segments of strobila
  • Anterior part - Contains the essential digestive parts
  • Middle part - Reproductive parts
  • Terminal portion - Gravid eggs
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3
Q

Attachment and anterior part of cestodes

A

Head / Scolex

* Houses the cephalic ganglion

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4
Q

The common name of Diphyllobotrium latum

A

Freshwater Broad fish tapeworm

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5
Q

The common name of Taenia solium

A

Pork tapeworm

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6
Q

The common name of T. saginata

A

Beef tapeworm

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7
Q

The common name of T. asiatica

A

Taiwan taenia

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8
Q

The common name of E. granulosus

A

Hydatid worm

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9
Q

The common name of Dipylidium caninum

A

Dog tapeworm / Double pored tapeworm

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10
Q

The common tapeworm of rats

A

Raillietina garisoni

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11
Q

Chain of egg-producing units

A

Progglotids

> They develop posteriorly from the neck region of the scolex

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12
Q

Cestodes are otherwise known as

A

Tapeworms

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13
Q

Characteristic body of cestodes

A

Ribbonlike

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14
Q

The crown of the scolex

A

Rostellum

* may be armed with hooks/ unarmed

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15
Q

The mature cestode is _ which means it contains both female and male reproductive organs

A

Hermaphroditic

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16
Q

Food is absorbed from the house through the cestode’s _

A

Integument

Outer covering/skin of the organism through diffusion

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17
Q

Oncosphere

A

Larva tapeworm within an embryonic envelope

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18
Q

The infective stage of cestodes

A

Hexacanth embryo / Oncosphere

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19
Q

The largest human tapeworm

A 
Diphyllobothrium latum
(Adults=15 m in length with 3000-4000 proglottids)
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20
Q

Uterine structure of D. latum

A

Rosette-shaped uterine structure

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21
Q

Number of sucking grooves/ bothria in D. latum

A

Two (shallow sucking grooves)

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22
Q

Only cestode to have an aquatic life cycle

A

D. latum

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23
Q

Reservoir host and Definitive host of D. latum

A

Reservoir: fish
Definitive: humans

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24
Q

How many intermediate hosts does D. latum require?

A

2

1st: Copepods (houses the first larval stage: coracidium and produces procercoid through shedding)
2nd: Fish / Crustaceans (ingests INFECTIVE procercoid larva, and develops to plerocercoid)

25
Q

Infective stage of D. latum

A

Plerocercoid

26
Q

Difference of coracidium, Procercoid, and plerocercoid

A

Coracidium: Has epithilium, ciliated, and bears 6 terminal hooks

Procercoid: Does not have epithelium (shedded coracidium)

Plerocercoid: Ribbonlike organism with an undivided scolex

27
Q

D. latum matures into an adult tapeworm within the human _

A

Small intestine

28
Q

D. latum eggs are sometimes confused with _ eggs

A

Paragonimus eggs

29
Q

Cestode infection that is transmitted to humans through the ingestion of dog and cat fleas

A

Dipylidium caninum

30
Q

Also known as the dwarf tapeworm

A

Hymenolepis nana

31
Q

Only cestode that requires 2 intermediate hosts

A

D. latum

32
Q

Identify the parasite:

Cucumber seed appearance/resemblance to a dried grain of rice

A

Dipylidium caninum

33
Q

Intermediate host of D. caninuum

A

Intermediate host: Dog/cat flea

*Reservoir hosts: humans, cats, dogs

34
Q

Since D. latum proglottids may be shed in the feces, and may stick to the skin around the anal area, they may be misdiagnosed as an infection of _

A

Enterobius vermicularis

  • symptoms of D. caninum are also very similar to pinworm infection
35
Q

Infective stage of D. caninum

A

Cysticercoids

36
Q

Identify:

Patient has an appearance of seedlike particles in the stool and undergarments of the patient

A

D. caninum

37
Q

The most common tapeworm with worldwide distribution

A

Hymenolepis nana

38
Q

Cestode infection wherein intermediate host is NOT required, allowing person-to-person spread possible

A

H. nana

39
Q

Humans are _ host in H. nana infection

A

Intermediate AND Definitive

40
Q

Refers to a large parasitic burden within the host

A

Hyperinfection

41
Q

T/F

H. nana is capable of autoinfection and Hyperinfection

A

TRUE

*Autoinfection- constant reproduction of the parasite within the host

42
Q

Difference of nana and diminuta eggs

A

H. nana eggs are smaller and have 4-8 POLAR FILAMENTS present in the space between the oncosphere and the eggshell

43
Q

Also known as the rat tapeworm

A

Hymenolepis diminuta

44
Q

Humans are the _ host in T. solium

A

Definitive & intermediate host

** presence of both adult and larval stages

45
Q

Intermediate host of T. solium

A

Pigs

46
Q

Can t. solium invade the CNS?

A

Yes (severe form)

47
Q

The major complication (patholgy) of T. solium

A

Cysticercosis

48
Q

T/F:

T. solium and T. saginata can be differentiated on the basis of egg morphology

A

FALSE. T. solium and T. saginata CANNOT be differentiated on the basis of egg morphology

49
Q

Number of lateral uterine branches in T. saginata and T. solium

A

T. saginata: >13 uterine branches

T. solium: 7-13 uterine branches

50
Q

Stain for uterine braches

A

India ink

51
Q

DOC for cestode infections

A

Praziquantel

52
Q

Cysticerci do not survive temperatures below _ or above _

A

below -10C

above 50C

53
Q

What is the 3rd taenia spp?

A

Taenia asiatica

54
Q

D. latum is previously known as _

A

Dibothriocephalus latus

55
Q

Most common parasitic disease of the CNS

A

Cysticercosis

56
Q

Longest cestode

A

T. saginata

57
Q

Smallest cestode

A

H. nana

58
Q

Shortest cestode

A

E. granulosus

59
Q

Tapeworm that can cause megaloblastic anemia

A

D. latum

Parasitology (10 decks)

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