E.vermcularis Flashcards
(19 cards)
What is the common name for Enterobius vermicularis?
Human pinworm
What is a characteristic symptom of Enterobius vermicularis infection?
Perianal itching or pruritus ani
What is the primary habitat of Enterobius vermicularis in humans?
Large Intestine (Cecum, appendix & colon)
Name the modes of transmission for Enterobius vermicularis.
Autoinfection, Person-to-person transmission, Ingestion/inhalation of eggs
What is the infective stage of Enterobius vermicularis?
Embryonated egg
What is the diagnostic stage of Enterobius vermicularis?
Eggs on the perianal folds, Adult worms
Does Enterobius vermicularis undergo migration?
Yes
When does the female Enterobius vermicularis typically migrate to the perianal region to lay eggs?
Nocturnal (at night)
What are the common laboratory diagnostic methods for Enterobius vermicularis?
Detection of adult worms; Demonstration of eggs (often using tape test).
What is the term for pinworm infection?
Enterobiasis
Besides perianal pruritus, what other symptoms might infected children with Enterobius vermicularis show?
Irritability, enuresis, & weight loss, vaginitis & urethritis.
Is Enterobius vermicularis infection associated with high eosinophilia or elevated IgE?
No, infection is not associated with a pronounced eosinophilia or with elevated IgE.
Describe the general morphology of adult Enterobius vermicularis worms.
Small, white, spindle-shaped and resemble short pieces of thread. Possess a pair of wing-like expansions (cervical alae) for both sexes.
Describe the morphology of an adult male Enterobius vermicularis.
2-4 mm by 0.1-0.2 mm. Posterior 1/3 of the body is curved. Live for about 7 weeks.
Describe the morphology of an adult female Enterobius vermicularis.
Longer, 8-12 mm in length & 0.3-0.5 mm in width. Posterior extremity is straight & drawn out into a thin pointed pin-like tail. Live 5-13 weeks.
Describe the morphology of an Enterobius vermicularis egg (shape, color, size, contents).
Colorless, not bile-stained & flattened on one side (planoconvex). 60 um by 30 um. Surrounded by a thin, smooth, transparent shell & usually contain fully developed larvae.
Do Enterobius vermicularis eggs float in saturated common salt solution?
Yes, they float.
What are some key prophylactic measures against Enterobius vermicularis infection?
Personal hygiene; wearing of gloves by infected children during night; frequent changing & washing of bed linen & night clothes; keeping bedrooms clean and dust free; treating infected persons.
What is a common treatment for Enterobius vermicularis infection?
Pyrantel pamoate
