Lab 3 Flashcards by Vilde Amalie Mathisen

What is the size of Taenia type egg?

50 um

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Method for detecting Taenia type eggs?

Flotation

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Tapeworm detected by the naked eye:

All of them

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How do you diagnose metacestodes?

Necropsy

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Cestode larvae in immature stage? IMP

Cysticercus

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How do we differentiate the eggs of Echinococcus granulosa and Taenia multiceps?

Cannot differentiate

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What is the Coracidium?

Ciliated oncosphere larvae
L1 stage of Diphyllobothrium latum
L1 Coracidium – L2 Procercoid – L3 Pleurocercoid

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If you detect Taenia type eggs in a faecal sample of a dog, it could be infected with:

Taenia multiceps,
Dipylidium caninum
Echinococcus granulosus

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How do you detect cystocercus bovis?

Necropsy and meat inspection

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Which species occur in dogs?

F. hepatica
T. ovis
D. latum

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The eggs of this parasite cannot be detected:

E. alveolaris, C. pisiformis and C cellulose since they are metacestodes

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Which form is infective in sheep?

Cistecercoid in Orbatidae

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Which statement is true?

Proglottids do not pass permanently with the faeces

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What does gravid segment mean?

When a proglottid migrates to the end of the tapeworm, and produces a huge amount of eggs.
It then detaches and is excreted in the faeces.

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Size of Taenia-type eggs?

30- 40 um

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What is the name of cestode larva that can swim in water?

Coracidium

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What statement is true for a segment of a cestode?

It can produce eggs.

It is hermaphroditic

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Which tapeworm can infect humans?

Diphyllobothrium

Dipylidium

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Which tapeworm produce eggs with angulated shape?

Moniezia

Anoplocephala

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Cestode larva carrying specimens of these intermediate host cannot infect humans:

Copepods

Box mites

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What organ is missing from the body of an adult cestode?

Digestive tract

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Larval stages of Taenia worms include:

Cysticercoid

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This kind of cysticercus occurs in skeletal muscles:

C. ovis
C. cellulosae
C. cervi

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What do the fertile cysticerci of Taenia worms contain?

One scolex

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In case of accidental ingestions this larva can infect humans:

Cysticercus bovis | Cysticercus cellulosae

This larvae has three-layered wall:

Hydatid cyst

Cestodes of Ruminants =

Moniezia

What kind of tapeworms are in the bile ducts of sheep?

None. They are in the intestine.

Symptoms by Moniezia can be seen (age):

Under 6 months old

Shape of Moniezia benedeni?

Quadrangular

How do we recognise eggs of M. expansa?

Triangular shape

What kind of tapeworm can be found in the bile duct of cattle?

None. In cattle and sheep, tapeworms are not found in the bile ducts.

Which statement is not true?

Prepatent period is 6 months in case of Moniezia

How many suckers does the scolex of Moniezia expansa have?

4 suckers

What does the egg of Moniezia benedeni contain?

Quadrangular eggs that contain a six-hooked oncosphaera inside.

What larval form is missing during development of Monienzia worms?

Coracidium, Plerocercoid

What larval form isn’t missing during development of Moniezia worms?

Oncosphera

What does the mature proglottid of a Moniezia benedeni worm contain?

Many testicles. | Two sets of sexual organs.

What larval stage is formed during development of Moniezia worms?

Cysticercoid | Oncospahaera

Cysticercoid can develop in:

Box-mite

Procercoid is:

Many tapeworms can develop from this larval form:

a) Cysticercoid b) Coenurus c) Cysticercus d) Trobilocercus

What is the size of cysticercoid?

a) 10um b) 50um c) 1000um d) Other

What does the sterile hydatid cyst contain?

Tissue fluid only

Where can we find genital opening on the mature segment of a Taenia species?

On one side

In Cestodes, what is the gravid segment?

Egg

Which has / have two sets of genitilia (in each segment)?

Moniezia Dipylidium Taenia

Cestodes of Equine =

Anoplocephala

Where can you find tapeworms during the necropsy of a horses?

In the small and large intestine.

Proudmann method detects:

Anoplocephala / Equine tapeworms

What shape do the eggs of Anopleucephala have?

Horse-shoe shape

What is the intermediate host of Anoplocephala worms?

Box-mites

These tapeworms can occur in the large intestine:

Anoplocephala

What is the infective larval form of the tapeworm of horses?

Cysticercoid

What can you detect in the faeces of a dog infected with D. caninum?

Cocoon, egg and gravid segment Flotation of large egg capsules (cocoons) from faeces. Each egg contains a six-hooked oncosphaera inside. Usually the whole gravid segments are shed by the faeces: They are pinkish, 2-3mm long and able to crawl for a short distance

A few mm long, active worm found in the faeces of a cat?

D. caninum

Cocoon found in infection caused by:

D. caninum

Worm eggs not examined by flotation?

D. caninum. Since the cocoon is much heavier, it is done with sedimentation or flotation in extremely dense fluid.

Tapeworm species found in a 6-week old puppy?

D. caninum

Elongated proglottids of Diphylidium have two sets of genitilia. True or false?

True

Cestode with double genitilia?

Diphylidium caninum

What is the best way to detect flea tapeworm eggs in faeces?

Flotation

The species of this genus can act as intermediate hosts for Dipylidium:

Ctenocephalides fleas and rarely hair lice (Trichodectes canis)

What is the size of an egg cocoon of flea tapeworms?

About 500 microns

These tapeworm has armed rostellum:

Dipylidium

Broad or Fish Tapeworm =

Diphyllobothrium

What is the infective stage of D. latum?

L3 – Plecocercoid

Inside of D. latum egg

Zygote

Infective stage of D. latum is L2. True or false?

False | It is L3 – Pleurocercoid

Which animals are susceptible for Diphyllobothrium infection?

Bears, Dogs, Cats | Notes – Fish-eating mammals, including humans

Which animals aren’t susceptible for Diphyllobothrium infection?

Cattle

How many hooks does the scolex of Diphyllobothrium worms have?

Zero

What kind of worms produce eggs without onchosphere?

Diphyllobothrium

Is T. ovis common in sheep flocks of the EU?

No. T. ovis effects dogs, not sheep!

Host of T. ovis?

Dog

Which is ‘hepatophilous’?

T. pisiformis

What can occur in sheep?

Cysticercus ovis

Cysticercus pistiformis can occur in:

Rabbits and hares

The name of Taenia taeniaformis larva is:

Strobilocercus

This animal can carry Taenia taeniaformis infection:

Rat

The name of Taenia hydatigena larva is:

Cysticercus tenuicollis

Where the larvae of Taenia hydatigena worms are can be found?

On the mesentery | On the liver

Which hosts are susceptible for the larval Taenia crassiceps infection?

Rodents

Intermediate host for Taenia pisiformis:

Hare | Rabbit

Where do you find T. solium adults in dogs?

Not found in dogs. Only found in humans.

Where can you find T. saginata in the red fox?

Not found. It is a human tapeworm.

This metacestode can develop into adult in humans:

Cystercus cellulosae

Larval stage of Taenia saginata is also called:

Cysticercus bovis

The species of this genus can act as intermediate host for Taenia saginata:

Bos

Adult Taenia saginata worms have:

Scolex

The species of this genus can act as intermediate host for Taenia solium:

Homo

Larvae of this Taenia live in subcutaneous and intermediate connective tissue:

T. serialis

What is the name of cestode larva that develops in the central nervous system?

Coenurus

Size of Echinococcus granulosa egg?

50 um as they are taenia type eggs

In a dog, E. alveolaris can be found where?

In the live

E. granulosus and E. alveolaris can both occur in humans.

Only E. alveolaris

E. multilocularis can be detected in infected humans with:

No method, since not found in humans.

What is the most effective drug against Echinococcus?

Praziquantel / Epsiquantel

What is the Metacestode form of E. granulosa?

E. hydatidosus

What is the Metacestode form of E. multilocularis?

E. alveolaris

Size of Echinococcus hydatidosus protosolex?

100 um

Echinococcus worms have:

Rostellum | Hooks

How many proglottids does the Echinococcus multilocularis worm have?

Which hosts are susceptible for the larval Echinocossu granulosus infection?

Mammals

What do the fertile caverns of Echinococcus multilocilaris contain?

Protoscolices and gelatinous mass

What is the most preferred site of Echinococcus multilocularis larva in sheep?

Lung

What is the size of an Echinococcus worm?

Around 3-6 millimetres

Lab 3 Flashcards

(107 cards)