Cestodes (PPT) Part III Flashcards by Gay Amor Tipolo Gacang

Q

Common name of Hymenolepis diminuta

A

Rat tapeworm

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Q

Accidental infections to humans of Hymenolepis nana results in

A

Hymenolepiasis

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Q

Life cycle of Hymenolepis nana:

A

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

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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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Q

Hooklets of the Hymenolopes diminuta

A

Fan-like arrangement

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Q

Diagnosis for Hymenolepid nana:

A

Identification of eggs from the stool
Scolex if the whole worm is expelled

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Q

Characteristic of Hymenolepis nana and Hymenolepis diminuta:

Scolex

A

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

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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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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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Q

Characteristic of Hymenolepis nana and Hymenolepis diminuta:

Intermediate host:

A

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

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Q

Characteristic of Hymenolepis nana and Hymenolepis diminuta:

Final host

A

H. nana: man
H. diminuta: norway rats

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Q

Common name for Diphyllobothrium latum

A

Broad or fish tapeworm

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Q

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

A

pernicious anemia

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Q

Diphyllobothrium latum’s scolex is

A

elongated, spoon shaped characterized by 2 longitudinal grooves

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Q

1st and 2nd intermediate host of Diphyllobotrium latum

A

1st: copepods
2nd: fish

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Q

Life cycle of Diphyllobotrium latum:

A

Egg/ova
Coracidium - with cilia
Cyclops/Copepods (Procercoid larva)
Freshwater fish (Plerocercoid larva)

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Q

Diphyllobothrium latum:

Infective stage to copepods

A

Coracidium

Q

Diphyllobothrium latum:

Infective stage to fish

A

Precercoid larva

Q

Diphyllobothrium latum:

Infective stage to humans

A

Plerocercoid larva

Q

Diagnostic stage of Diphyllobothrium latum

A

Unembryonated eggs in the feces

Q

Definitive host of Diphyllobothrium latum

A

Human

Q

Clinical significance of Diphyllobothrium latum

A

Vitamin B12 deficiency

Q

Diagnosis of Diphyllobothrium latum

A

Raw-fish diet and PA is suggestive of diphyllobothriasis
Finding of characteristic operculated egg or proglottids in
stool or vomited
DFS or Kato Katz technique

Q

Common name of Dipylidium caninum

A

Double-pored tapeworm

It is the common parasite of dogs and cats worldwide

Dipylidium canicum

Hallmark of the double-pored tapeworm's hooklets

1-7 rows of rose thorn shaped hooklets

Intermediate hosts of Dipylidium caninum

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

Causes cystic hydatid cyst disease.

Echinococcus granulosus

Common name of Echinococcus granulosus

Hydatid tapeworm

Definitive host of Hydatid tapeworm

Dogs and other canines

Intermediate host of hydatid tapeworm

Sheep, Goat, Swine, etc

Accidental host of hydatid tapeworm

Humas

Infective stage of hydatid tapeworm

Embryonated egg

Diagnostic stage of hydatid tapeworm:

Hysdatid cysts

Hydatid tapeworm: ____ migrate into the mesenteric venules

Oncosphere

Hydatid tapeworm: It is formed through central vesiculation

Larval cyst

Hydatid tapeworm: Found in brood capsules

Protoscolices

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

Hydatid sand

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

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

E. granulosus are called

Unilocular hydatid cyst

E. multilocularis are called

Alveolar cyst