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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
Nematode capable of indirect life cycle where it is free living
S. stercoralis
26
Nematode capable of autoinfection
S. stercoralis
27
Describe how autoinfection with S. stercoralis occurs
Filariform larva develop in host's intestine, invades bloodstream
28
Whipworm
Trichuris trichiura
29
IS of T. trichiura
Ova
30
Describe the T. trichiura eggs
Barrel-shaped | Bipolar hyaline plugs
31
DS of T. trichiura
Ova
32
Trichina worm
Trichinella spiralis
33
Lab diagnosis of T. trichiura
Histologic preparation of encysted tissue
34
Guinea worm
Dracunculus medinensis
35
MOT of D. medinensis
Ingestion of infected copepods
36
Lab diagnosis of D. medinensis
Examination of emerging larva from skin ulcer
37
Nonintestinal nematodes
Trichinella spiralis | Dracunculus medinensis

Elsevier Parasitology (RVSP) (10 decks)

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