NEMATODES Flashcards
NEMATODES are commonly known as
intestinal roundworms
A diverse group of parasitic worms that can infect humans
nematodes
organisms that are multicellular & contain internal organ systems
helminths
true or false: Adult female worms are usually larger than adult males
true
3 Basic Morphologic Forms of nematodes
eggs
larvae
adult worms
true or false: Adult worms are equipped with a complete digestive & reproductive system
True
reinfection vs. autoinfection
reinfection: individual has been exposed once again via external source
autoinfection: continuous infection without exposure to external source
a term which decribes nematodes characteristic or ability to exist independently of a host
free-living
environment in which nematodes’ larvae thrive
warm & moist soil
(2-4 weeks)
Three (3) Factors that may contribute to the severity of a nematode infection
Number of worms present
Length of time infection persists
Overall health of the host
common name for ENTEROBIUS VERMICULARIS
pinworm
seatworm
Common associated disease & condition name for ENTEROBIUS VERMICULARIS
Enterobiasis, Pinworm Infection
specimen of choice for ENTEROBIUS VERMICULARIS
cellophane tape preparation collected from perianal region of suspected individual with infection
infective & diagnostic stage of ENTEROBIUS VERMICULARIS
infective stage = mature embryonated egg
diagnostic stage = eggs found in the perianal region
How long is the incubation before the eggs of E. vermicularis become infected?
4-6 hours
other regions in which infective eggs of Enterobius vermicularis can be found
dust
clothing
linens
sandboxes
this is the most common helminth known to cause infection in the US
Enterobius vermicularis
Transmission of pinworm occurs by
hand-to-mouth transmission
A term to describe when infective pinworm eggs that migrate back into the host body, develop, & reproduce rather than becoming dislodged
retroinfection
The treatment of choice for the eradication of E. vermicularis
Albendazole
Mebendazole
Pyrantel pamoate
Most common symptom of Enterobiasis
Pruritus Ani
intense itching & inflammation of the anal &/or vaginal areas
pruritus ani
other symptoms of enterobiasis
intestinal irritation
mild nausea or vomiting
irritability
difficulty sleeping
Minute ulcers
mild intestinal inflammation
abdominal pain
