Enterobius Vermicularis

Question 1

EV

Common Name

Answer 1

1. Pinworm
2. Threadworm
3. seatworm
4. society worm
5. Seatworm
6. Oxyuris

Question 2

Is there Autoinfection EV?

Answer 2

Yes

Question 3

EV

Disease:

Answer 3

1. Enterobiasis
2. Oxyuriasis

Question 4

Male Worm
● Measures 2 to 5 mm by 0.1 to 0.2 mm.
● It has a characteristic_____ tail with a______ spicule and_____
● Relatively_____ that the female worm
● They are rarely seen because they die after_____.
●_____ musculature

Answer 4

curved

single (1)/ cephalic alae

smaller

copulation

Meromyarian

Question 5

Female EV

● Measures 8 to 13 mm by 0.4 mm.
● It has a long____ tail hence the name, pinworm.
● Uteri of the gravid female are distended with eggs.
● Capable of laying as much as______

Answer 5

pointed

4,672 to 16,888 eggs/day

Question 6

OV EV

Are _____
● measures 50 to 60 micra by 20 to 30 micra averaging 55 by 36 micra
● the translucent shell:
○ outer-
○ inner-

● outside the host, eggs become infective in____

Answer 6

asymmetrical

triple albuminous covering
lipoidal membrane

four to six hours

Question 7

Phasmid/ Aphasmid

Answer 7

Phasmid

Question 8

HOST EV

Answer 8

Humans are considered the only host for E. vermicularis

Question 9

Habitat

Answer 9

Large intestine

Question 10

MOT EV

Answer 10

Ingestion
Inhalation

Question 11

Source of infection

Answer 11

Contact borne

Question 12

Infective stage EV

Answer 12

Embryonated ova

Question 13

Diagnostic stage

Answer 13

Ova

Question 14

Pathogenesis & Clinical Manifestations

Answer 14

Pathology:

1. Perianal itching or pruritus ani
2. Autoinfection
3. Familial disease

Question 15

Diagnosis EV

Answer 15

Scotch tape technique (cellulose tape)

Question 16

Treatment

Answer 16

1. Pyrantel pamoate
2. Albendazole
3. Mebendazole

Negative Scotch Tape Swab test: ● 7 perianal smears

Question 17

Enterobius vermicularis
Common Name:
Final Host:
Habitat:
Diagnostic Stage:
Infective Stage:
Sources of Infection:
Mode of transmission:

Answer 17

Pinworm, seatworm, society worm

Man

Large Intestine

Ova

embryonated ova

Contact borne

Ingestion, inhalation

Question 18

Is Autoinfection possible???

Answer 18

VERY POSSIBLE

Question 19

COMMONLY AFFECTED

Answer 19

School-aged and pre-school-aged children
Institutionalized persons
Household members and caretakers of persons with enterobiasis

Question 20

RISK FACTORS

Answer 20

Overcrowding
Thumb-sucking
Nail-biting
Lack of parental knowledge on pinworms

Question 21

Note: Males are RARELY seen because

Answer 21

they usually die after copulation

Question 22

Somatic musculature

Answer 22

Meromyarian

Question 23

The_____ larva is the initial noninfective stage, whereas the____ larva is the infective stage.

Answer 23

rhabditiform

filariform

Question 24

OVA

Color:

mechanical protection

chemical protection

Answer 24

Translucent shell (colorless)

Outer triple albuminous covering

Inner embryonic lipoidal membrane

Question 25

Migrates from the colon to perianal region during evening to deposit eggs

Answer 25

Gravid female Enterobius vermicularis

Question 26

Embryonated eggs Fully mature within ____hours

Answer 26

4-6

Question 27

Embryonated egg Sometimes, adult

Answer 27

Diagnostic Stages

Question 28

Embryonated Egg - 3rd stage larva

Answer 28

Infective Stage

Question 29

Modes of Transmission

Answer 29

Ingestion Inhalation Autoinfection and Retroinfection

Question 30

Habitat

Answer 30

Large intestine especially the cecum

Question 31

Enterobius vermicularis Heart lung?

Answer 31

No

Question 32

itchiness of the perianal area (especially during sleeping time at night)

Answer 32

PRURITUS ANI