(M) Nematoda: Secernentea: Oxyurida (lecture-based)

Question 1

Superfamily of oxyurida

Answer 1

Oxyuroidea

Genus E. vermicularis

Question 2

• Produces enterobiasis or oxyuriasis
• Cosmopolitan but more common in Cold & Temperate Regions.
• Infects Children more than Adults.
• Directly Proportional on the Prevalence and Incidence of Infection.

Answer 2

E. vermicularis

Question 3

• General Prevalence in Children: 0.2 - 20%
• Most common in persons who live in Crowded Living Conditions and in Individuals who are Institutionalized (prevalence 50-100%).
• General Prevalence in some Regions may be as high as 12%.
• Egg Carrier Rates vary by country, from 0.1 - 98.4%.
• School-aged Children are more at risk.
• In Adults, most common in Parents aged 30 - 39 years old
• Males are affected as Twice as often as Females.
• Except in people aged 5 - 14 years old.
• Where infection is predominant in Females.

Answer 3

E. vermicularis

Question 4

Most common helminthic infestation in the US

Answer 4

E. vermicularis

Question 5

Enterobius vermicularis AKA

Answer 5

pinworm, seat worm or society worm

Question 6

Enterobius vermicularis

MOT

Answer 6

• Person-to-Person.
• Inhalation of eggs that are dislodged from Bed Linens, Sheets, Blankets, and Clothing.
• Direct Transfer of the Eggs from Anus to Mouth of one’s self resulting to Autoinfection.
• Promiscuous Sexual Practice

Question 7

Enterobius vermicularis

Infective stage

Answer 7

Embryonated egg

Question 8

Enterobius vermicularis

Diagnostic Stage

Answer 8

Eggs on perianal folds (unembryonated)

Question 9

Enterobius vermicularis

What happens when the eggs are deposited in the perianal folds?

Answer 9

Self-infection occurs

kasi kamot ta’s dala sa bibig

Question 10

Enterobius vermicularis

The adult pinworm establish themselves in the?

Answer 10

large intestine (colon)

Question 11

Enterobius vermicularis

Time Interval between the Ingestion of Infective Egg to the Oviposition. Meaning the laying of eggs of the adult female in the Perianal Area is about?

Answer 11

1 month

Question 12

Enterobius vermicularis

Characteristically, the Gravid Female or Fertile Female would migrate (what time of the day)

Answer 12

nocturnally (at night_

Question 13

Enterobius vermicularis

MOT

Answer 13

fecal-oral route

kamot pwet ta’s lagay sa bunganga

Question 14

Enterobius vermicularis

Clinical manifestations

Answer 14

• nocturnal pruritus ani
• Vaginitis
• Group infection
• Nervousness, insomnia, nightmares, irritability, even convulsion

Question 15

Enterobius vermicularis

Overwhelming infection, you can still see the larvae.

Answer 15

Nocturnal Pruritus ani

Question 16

Enterobius vermicularis

For females, since the anus is close to the vagina. It may cause

Answer 16

Vaginitis:

Question 17

Enterobius vermicularis

Laboratory diagnosis

Answer 17

• Demonstration of the eggs (or adults)
• Graham scotch tape
• NIH swab technique
• Fecal smear

Question 18

Enterobius vermicularis

Treatment

Answer 18

• Mebendazole
• Pyrantel pamoate
• Piperazine citrate

Question 19

Enterobius vermicularis

Prevention and control

Answer 19

• Good Personal Hygiene.
• Regular and often Changing and Washing of Bed
• Sheets and Night Garments.
• Floor, Toilet Seats, Shelves, and Ledges cleaned with
• Strong Cresol followed by Washing.
• Public Education.