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Parasitology (Lecture) > Cestodes (PPT) Part III > Flashcards

Cestodes (PPT) Part III Flashcards

1
Q

Common name of Hymenolepis diminuta

A

Rat tapeworm

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2
Q

Accidental infections to humans of Hymenolepis nana results in

A

Hymenolepiasis

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3
Q

Life cycle of Hymenolepis nana:

A

Egg –> Intermediate host –> Cysticeroid –> Adult –> back to egg

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4
Q

The scolex of H. diminuta differs from that of the H. nana is by having a ______ rostellum

A

rudimentary unarmed rostellum (no hooklets)

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5
Q

Hooklets of the Hymenolopes diminuta

A

Fan-like arrangement

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6
Q

Diagnosis for Hymenolepid nana:

A
  1. Identification of eggs from the stool
  2. Scolex if the whole worm is expelled
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7
Q

Characteristic of Hymenolepis nana and Hymenolepis diminuta:

Scolex

A

H. nana: armed rostellum
H. diminuta: unarmed rostellum

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8
Q

Characteristic of Hymenolepis nana and Hymenolepis diminuta:

Eggs

A

H. nana: with 4 to 8 polar filaments
H. diminuta: without filaments

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9
Q

Characteristic of Hymenolepis nana and Hymenolepis diminuta:

Infective stage

A

H. nana: Eggs (direct) and Cysticercoid larvae (indirect)
H. diminuta: Cysticercoid larvae

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10
Q

Characteristic of Hymenolepis nana and Hymenolepis diminuta:

Intermediate host:

A

H. nana: Fleas and flour beetles
H. diminuta: Insects

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11
Q

Characteristic of Hymenolepis nana and Hymenolepis diminuta:

Final host

A

H. nana: man
H. diminuta: norway rats

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12
Q

Common name for Diphyllobothrium latum

A

Broad or fish tapeworm

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13
Q

Diphyllobothrium latum may produce in some persons a condition closely resembling _______

A

pernicious anemia

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14
Q

Diphyllobothrium latum’s scolex is

A

elongated, spoon shaped characterized by 2 longitudinal grooves

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15
Q

1st and 2nd intermediate host of Diphyllobotrium latum

A

1st: copepods
2nd: fish

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16
Q

Life cycle of Diphyllobotrium latum:

A
  1. Egg/ova
  2. Coracidium - with cilia
  3. Cyclops/Copepods (Procercoid larva)
  4. Freshwater fish (Plerocercoid larva)
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17
Q

Diphyllobothrium latum:

Infective stage to copepods

A

Coracidium

18
Q

Diphyllobothrium latum:

Infective stage to fish

A

Precercoid larva

19
Q

Diphyllobothrium latum:

Infective stage to humans

A

Plerocercoid larva

20
Q

Diagnostic stage of Diphyllobothrium latum

A

Unembryonated eggs in the feces

21
Q

Definitive host of Diphyllobothrium latum

A

Human

22
Q

Clinical significance of Diphyllobothrium latum

A

Vitamin B12 deficiency

23
Q

Diagnosis of Diphyllobothrium latum

A
  1. Raw-fish diet and PA is suggestive of diphyllobothriasis
  2. Finding of characteristic operculated egg or proglottids in
    stool or vomited
  3. DFS or Kato Katz technique
24
Q

Common name of Dipylidium caninum

A

Double-pored tapeworm

25
Q

It is the common parasite of dogs and cats worldwide

A

Dipylidium canicum

26
Q

Hallmark of the double-pored tapeworm’s hooklets

A

1-7 rows of rose thorn shaped hooklets

27
Q

Intermediate hosts of Dipylidium caninum

A
  1. Ctenocephalides canis (dog flea)
  2. Ctenocephalides felis (cat flea)
  3. Pulex irritans (human flea)
  4. Trichodectes canis (dog louse)
28
Q

Causes cystic hydatid cyst disease.

A

Echinococcus granulosus

29
Q

Common name of Echinococcus granulosus

A

Hydatid tapeworm

30
Q

Definitive host of Hydatid tapeworm

A

Dogs and other canines

31
Q

Intermediate host of hydatid tapeworm

A

Sheep, Goat, Swine, etc

32
Q

Accidental host of hydatid tapeworm

A

Humas

33
Q

Infective stage of hydatid tapeworm

A

Embryonated egg

34
Q

Diagnostic stage of hydatid tapeworm:

A

Hysdatid cysts

35
Q

Hydatid tapeworm:

____ migrate into the mesenteric venules

A

Oncosphere

36
Q

Hydatid tapeworm:

It is formed through central vesiculation

A

Larval cyst

37
Q

Hydatid tapeworm:

Found in brood capsules

A

Protoscolices

38
Q

When protroscolices &
brood capsules lie free
in cyst, they are
referred to as

A

Hydatid sand

39
Q

The most common site and most important site of involvement for hydatid tapeworm:

A
  1. Liver (66%)
  2. Lungs (22%)
  3. Kidneys (3%)
  4. Brain and orbit
40
Q

E. granulosus are called

A

Unilocular hydatid cyst

41
Q

E. multilocularis are called

A

Alveolar cyst

Parasitology (Lecture) (11 decks)

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