Lecture: Intestinal Nematodes

Question 1

Largest and most common nematode

Answer 1

Ascaris lumbricoides

Question 2

Measure of male Ascaris

Answer 2

15 – 30 cm by 3 mm

Question 3

Measure of female Ascaris

Answer 3

20-45 cm by 5 mm

Question 4

Terminal mouth of Ascaris has _

Answer 4

Trilobate lips

Question 5

Measure of fertilized Ascaris ova

Answer 5

45-75 microns by 35-45 microns

Question 6

Measure of unfertilized Ascaris ova

Answer 6

88-94 microns

Question 7

What layer is absent in unfertilized Ascaris ova?

Answer 7

Vitelline layer

Question 8

Ascaris ova without mammillary coat are called _

Answer 8

Decorticated

Question 9

Ascaris ova with mammillary coat are called _

Answer 9

Corticated

Question 10

Fertilized ova needs embryonation in _

Answer 10

Soil

Question 11

A female Ascaris worm has a productive daily output of

Answer 11

200,000

Question 12

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

Answer 12

2 to 2 ½ months
12 to 18 months

Question 13

Ascaris of pig

Answer 13

Ascaris suum

Question 14

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

Answer 14

Neuromuscular blocking effect

Question 15

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

Answer 15

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

Question 16

Measure of adult Toxocara female worm

Answer 16

10-12 cm

Question 17

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

Answer 17

Because egg-laying adults are not present.

Question 18

Measure of Trichuris female

Answer 18

3.5 to 5 cm

Question 19

Measure of Trichuris male

Answer 19

3 to 4.5 cm

Question 20

Measure of Trichuris ova

Answer 20

50-54 by 22-23 microns

Question 21

Distinguishing feature of Trichuris ova

Answer 21

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

Question 22

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

Answer 22

30-90 days

Question 23

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

Answer 23

3,000 to 10,000

Question 24

Life span of Trichuris

Answer 24

4-6 years

Question 25

The prevalence rate of Trichuriasis in the Philippines ranges from _

Answer 25

80-90%

Question 26

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

Answer 26

Two pairs of ventral teeth

Question 27

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

Answer 27

Copulatory bursa or bursa copulatrix

Question 28

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

Answer 28

Tridigitate or Tripartite

Question 29

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

Answer 29

Pair of semi-lunar cutting plates

Question 30

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

Answer 30

Bipartite or bidigitate

Question 31

Feeding stage of Hookworm

Answer 31

L1 or Rhabditiform

Question 32

Non-feeding stage or infective stage of Hookworm

Answer 32

L3 or Filariform

Question 33

Measure of Hookworm eggs

Answer 33

56-60 by 34-40 microns

Question 34

The life span of the Hookworms is from

Answer 34

2-13 years

Question 35

Ancylostoma duodenale female produces _ daily

Answer 35

30,000 eggs

Question 36

Necator americanus female produces _ daily

Answer 36

9,000 eggs

Question 37

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

Answer 37

Ground itch or dew itch

Question 38

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

Answer 38

Pulmonary lesion or Wakana disease

Question 39

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

Answer 39

Creeping eruption or Cutaneous larval migrans

Question 40

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

Answer 40

Hypoalbuminemia

Question 41

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

Answer 41

5-45% N. americanus

Question 42

Strongyloides of monkeys and primates

Answer 42

S. fuelleborni

Question 43

Measure of parasitic S. stercoralis female

Answer 43

2–7 mm in length 30–4 um in width

Question 44

Measure of E. vermicularis male

Answer 44

2-5mm in length

Question 45

Measure of E. vermicularis female

Answer 45

8-13mm in length

Question 46

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

Answer 46

Cephalic alae

Question 47

Measure of E. vermicularis eggs

Answer 47

50–60 by 20–30 microns

Question 48

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

Answer 48

6 hours

Question 49

A gravid female may oviposit _ eggs per day

Answer 49

4,672 to 16,888

Question 50

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.

Answer 50

29% 56%

Question 51

Measure of C. philippinensis male

Answer 51

2.13 to 3.17 mm in length

Question 52

Measure of C. philippinensis female

Answer 52

2.5 to 4.3 mm in length

Question 53

Two Types of Capillaria female

Answer 53

Typical Atypical

Question 54

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

Answer 54

1963 Ilocos Norte