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Clinical Parasitology > Lecture: Intestinal Nematodes > Flashcards

Lecture: Intestinal Nematodes Flashcards

1
Q

Largest and most common nematode

A

Ascaris lumbricoides

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2
Q

Measure of male Ascaris

A

15 – 30 cm by 3 mm

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3
Q

Measure of female Ascaris

A

20-45 cm by 5 mm

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4
Q

Terminal mouth of Ascaris has _

A

Trilobate lips

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5
Q

Measure of fertilized Ascaris ova

A

45-75 microns by 35-45 microns

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6
Q

Measure of unfertilized Ascaris ova

A

88-94 microns

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7
Q

What layer is absent in unfertilized Ascaris ova?

A

Vitelline layer

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8
Q

Ascaris ova without mammillary coat are called _

A

Decorticated

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9
Q

Ascaris ova with mammillary coat are called _

A

Corticated

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10
Q

Fertilized ova needs embryonation in _

A

Soil

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11
Q

A female Ascaris worm has a productive daily output of

A

200,000

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12
Q

Ovipositing female develop in about _ after infection and they live from _

A

2 to 2 ½ months
12 to 18 months

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13
Q

Ascaris of pig

A

Ascaris suum

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14
Q

Piperazine and Pyrantel pamoate are used these days because these drugs have a _ on the parasite causing paralysis.

A

Neuromuscular blocking effect

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15
Q

Stool examination may give a negative Ascaris finding in the following conditions:

A

a. when the patient is actually free from Ascaris infection
b. worms are still immature in the lumen
c. during larval migration
d. when only male worms are present in the intestine

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16
Q

Measure of adult Toxocara female worm

A

10-12 cm

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17
Q

Examination of stool from infected patients of Toxocara is not useful. Why?

A

Because egg-laying adults are not present.

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18
Q

Measure of Trichuris female

A

3.5 to 5 cm

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19
Q

Measure of Trichuris male

A

3 to 4.5 cm

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20
Q

Measure of Trichuris ova

A

50-54 by 22-23 microns

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21
Q

Distinguishing feature of Trichuris ova

A

Barrel shaped/lemon shaped/football shaped or Japanese lantern in appearance with prominent bipolar plugs on both ends

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22
Q

The development period from the ingestion of Trichuris eggs to ovipositing adult worms covers about

A

30-90 days

23
Q

The number of eggs produced per day by a Trichuris female has been establishing at

A

3,000 to 10,000

24
Q

Life span of Trichuris

A

4-6 years

25
Q

The prevalence rate of Trichuriasis in the Philippines
ranges from _

A

80-90%

26
Q

The large buccal capsule of A. duodenale is equipped with _

A

Two pairs of ventral teeth

27
Q

The male A. duodenale worms have a fan-like organelle at the posterior portion known as _

A

Copulatory bursa or bursa copulatrix

28
Q

The copulatory bursa of A. duodenale has a _ or _ dorsal ray

A

Tridigitate or Tripartite

29
Q

The buccal capsule of N. americanus is provided with a _

A

Pair of semi-lunar cutting plates

30
Q

The bursa copulatrix of N. americanus is longer than broad with a _ or _ dorsal ray

A

Bipartite or bidigitate

31
Q

Feeding stage of Hookworm

A

L1 or Rhabditiform

32
Q

Non-feeding stage or infective stage of Hookworm

A

L3 or Filariform

33
Q

Measure of Hookworm eggs

A

56-60 by 34-40 microns

34
Q

The life span of the Hookworms is from

A

2-13 years

35
Q

Ancylostoma duodenale female produces _ daily

A

30,000 eggs

36
Q

Necator americanus female produces _ daily

A

9,000 eggs

37
Q

Percutaneous entry of the infective filariform larvae is often characterized by an itching sensation or dermatitis known as

A

Ground itch or dew itch

38
Q

A syndrome caused by the massive pulmonary migration of larval stages
of hookworms

A

Pulmonary lesion or Wakana disease

39
Q

A dermatitis characterized by serpiginous intracutaneous lesions caused by migration of the filariform larvae or nematode larvae that normally do not infect the human host like A. caninum and A. braziliense

A

Creeping eruption or Cutaneous larval migrans

40
Q

Low level of albumin due to combined loss of blood, lymph and protein via sucking of Hookworms

A

Hypoalbuminemia

41
Q

In the Philippines, the overall prevalence rate of hookworm infection is about _ wherein the
dominant specie is _

A

5-45%
N. americanus

42
Q

Strongyloides of monkeys and primates

A

S. fuelleborni

43
Q

Measure of parasitic S. stercoralis female

A

2–7 mm in length
30–4 um in width

44
Q

Measure of E. vermicularis male

A

2-5mm in length

45
Q

Measure of E. vermicularis female

A

8-13mm in length

46
Q

A pair of lateral cuticular wing-like expansion at the anterior of E. vermicularis end known as _

A

Cephalic alae

47
Q

Measure of E. vermicularis eggs

A

50–60 by 20–30 microns

48
Q

The eggs are fully embryonated when laid and will mature within _ after oviposition of gravid female

A

6 hours

49
Q

A gravid female may oviposit _ eggs per day

A

4,672 to 16,888

50
Q

In the Philippines, it is _ among school children from exclusive private schools and _ from those coming from public schools are found with E. vermicularis infection.

A

29%
56%

51
Q

Measure of C. philippinensis male

A

2.13 to 3.17 mm in length

52
Q

Measure of C. philippinensis female

A

2.5 to 4.3 mm in length

53
Q

Two Types of Capillaria female

A

Typical
Atypical

54
Q

The first case of human infection with Capillaria philippinensis occurred in _ from _

A

1963
Ilocos Norte

Clinical Parasitology (11 decks)

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