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Parasitology > Taeniid Cestodes > Flashcards

Taeniid Cestodes Flashcards

1
Q

Significance of taeniids

A

livestock and meat industry

some zoonotic

clinical disease (humans)

Public health impact

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2
Q

What is a cysticercosis

A

Cyst in the IH

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3
Q

Random taenia facts

A
  • Branched uterus
  • unpaired genitals
  • genital pores in irregular sequence on either side
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4
Q

Types of larval cysts

A

Cysticercus-> cysticercosis - Taenia

Coenurus-> coenuriasis - other Taenia

Hydatid-> hydatidosis - Echinococcus spp

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5
Q

Taenia solium (pork measles worm) lifecycle and host

A

Egg -> Oncosphere -> Cysticercus (pig, humans, muscles/CNS) -> adult (humans)

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6
Q

Features of Taenia solium

A
  • usually only 1 adult in SI (ie. solium)
  • 5-10m long
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7
Q

Laval stage of Taenia solium

Affinity

A

Cysticercus cellulosae

Oncosphere carried in blood stream to brain, muscles and subcutis tissue. Affinity for nervous tissue

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8
Q

Taenia saginata IH

and DH

A

Cattle; musculature

Humans

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9
Q

Taenia saginata common name

size

larval stage name and distribution

A

beef measles worm

5-15m

Cysticercus bovis in muscles.

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10
Q

Lifecycles of human Taenia

A
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11
Q

Which Taenia?

A

Taenia saginata

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12
Q

Which Taenia?

A

Teania solium

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13
Q

IH of Taenia ovis

A

Sheep, goat; musculature

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14
Q

DH of Taenia ovis

A

canid; dog and fox

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15
Q

Features of Cysticercus ovis

A

mostly in heart, diaphragm and masseter muscles

Cysts rapidly degenerate to form granulomas

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16
Q

What has caused these lesions?

A

Taenia hydatigena

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17
Q

IH of Taenia hydatigena

A

Ungulates; liver+omentum

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18
Q

DH of Taenia hydatigena

A

canid

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19
Q

Common name of Taenia hydatigena

A

False hydatid worm

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20
Q

Cysticercus tenuicollis (from T. hydatigena) features

A

attached to omentum in sheep, cattle, pigs.

oncosphers burrow through liver for 1 month -> peritoneal cavity and establishes in omentum

may lead to Black Disease

  • liver condemnation
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21
Q

Taenia pisiformis IH

A

Rabbit, hares; liver+omentum

22
Q

DH of T. pisiformis

23
Q

Cysticercus forming Taenia

A

T. solium

T. saginata

T. ovis

T. hydatigena

T. pisiformis

T. taeniaeformis

24
Q

DH of T. taeniaeformis

25
Q

IH of T. taeniaeformis

A

rats, mice; liver

26
Q

Larval stage of T. taeniaeformis

A

Strobilocercus fasciolaris

27
Q

What is a cysticercus

A

Fluid filled sac with a protoscolex

28
Q

What is a coenurus?

A

Many protoscolex on the internal surface of a fluid filled sac

29
Q

What is a hydatid?

A

A fluid case with more coenuri within it

30
Q

What taenia form coenurus?

A

T. multiceps

T. serialis

31
Q

Lifecycle stages of Taenia multiceps

A

Egg -> Oncosphere -> Coenurus (ungulates; CNS) -> adult (canid)

32
Q

Disease caused by T. multiceps

A

Progressive (6-8 months) -> incoordination, head pressing, blindness

33
Q

Differentials of T. multiceps

A

Listeriosis, parelaphostrongylosis, scrapie, ‘mad cow’

34
Q

What caused this lesion?

A

T. multiceps

35
Q

Where is T. multiceps found?

A

New Zealand, UK

not in Aus

36
Q

IH host of T. serialis

A

rabbits, hares; subcutaneous

37
Q

Type of cyst?

From what species?

A

Coenurus

T. serialis

38
Q

DH of T. serialis

40
Q

What causes hydatid cysts?

A

Echinococcus

41
Q

Alveolar echinococcosis is caused by?

A

Echinococcus multilocularis

42
Q

Cystic (unilocular) echinococcosis is caused by?

A

Echinococcus granulosus

43
Q

Lifecycle of Echinococcus granulosus + epidemiology

A

Endemic in Aus

Has domestic (pig, sheep, cattle) and sylvatic (kangaroo) cycles

44
Q

Common name of Echinococcus granulosus

A

Hydatid tapeworm

45
Q

Size og Echinococcus granulosus

how many segments?

How many strains?

A

2-5mm

3-5 segments

9 strains

46
Q

Pathology of Echinococcus granulosus in canids

A

No pathology and no protective immunity

47
Q

Pathogenesis of E. granulosus in IH

A

Primary hydatidosis - pressure atrophy and collateral circulation

Secondary hydatidosis (rupture) - Anaphylactic shock due to a huge amount of antigen formed

48
Q

How to treat hydatidosis?

A

Surgical removal - have to drain cycsts first

Benzimidasols have low efficacy

49
Q

Lifecycle of Echinococcus multilocularis

A

Alveolar hydatid in rodents/humans

Egg -> oncosphere -> alveolar hydatid -> adult

50
Q

Features of the larvae

A

Invasive and metastatic properties. Therefor surgical excision is almost impossible.

51
Q

Distribution of E. multilocularis

A

Not in Aus

Parasitology (30 decks)

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