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Elsevier Parasitology (RVSP) > 2. Nematodes > Flashcards

2. Nematodes Flashcards

1
Q

Most common intestinal helminth infection worldwide

A

A. lumbricoides

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2
Q

Diagnostic stage (DS) of A. lumbricoides

A

Ova in stool

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3
Q

Infective stage (IS) of A. lumbricoides

A

Ova

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4
Q

Pinworm

A

Enterobius vermicularis

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5
Q

Specimen of choice for E. vermicularis

A

Scotch tape preparation

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6
Q

IS of E. vermicularis

A

Ova

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7
Q

DS of E. vermicularis

A

Ova

Larva

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8
Q

E. vermicularis ova is infective within

A

4-6 hours

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9
Q

Mechanism of retroinfection by E. vermicularis

A

Ova hatch in anus but migrate back into colon to reproduce

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10
Q

Mechanism of autoinfection by E. vermicularis

A

Infective ova are ingested, hand to mouth

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11
Q

E. vermicularis ova may cary _______________

A

Dientamoeba fragilis

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12
Q

New world hookworm

A

Necator americanus

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13
Q

DS of N. americanus

A

Ova

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14
Q

IS of N. americanus

A

Third-stage filariform larvae

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15
Q

Roundworm

A

Ascaris lumbricoides

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16
Q

Hookworm morphologic form with pointed tail

A

Third-stage filariform larva

17
Q

Differentiate N. americanus and A. duodenale based on buccal cavity

A

N. americanus: cutting plates

A. duodenale: teeth

18
Q

An intense dermal irritation due to repeated infections of hookworm

A

Ground itch

19
Q

Old World hookworm

A

Ancylostoma duodenale

20
Q

Threadworm

A

Strongyloides stercoralis

21
Q

DS of S. stercoralis

A

Rhabditiform larva in stool

22
Q

IS of S. stercoralis

A

Third-stage filariform larva

23
Q

IS of A. duodenale

A

Third-stage filariform larva

24
Q

Nematode with notched tail

A

S. stercoralis (filariform larva)

25
Q

Nematode capable of indirect life cycle where it is free living

A

S. stercoralis

26
Q

Nematode capable of autoinfection

A

S. stercoralis

27
Q

Describe how autoinfection with S. stercoralis occurs

A

Filariform larva develop in host’s intestine, invades bloodstream

28
Q

Whipworm

A

Trichuris trichiura

29
Q

IS of T. trichiura

30
Q

Describe the T. trichiura eggs

A

Barrel-shaped

Bipolar hyaline plugs

31
Q

DS of T. trichiura

32
Q

Trichina worm

A

Trichinella spiralis

33
Q

Lab diagnosis of T. trichiura

A

Histologic preparation of encysted tissue

34
Q

Guinea worm

A

Dracunculus medinensis

35
Q

MOT of D. medinensis

A

Ingestion of infected copepods

36
Q

Lab diagnosis of D. medinensis

A

Examination of emerging larva from skin ulcer

37
Q

Nonintestinal nematodes

A

Trichinella spiralis

Dracunculus medinensis

Elsevier Parasitology (RVSP) (10 decks)

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