3-2 Intestinal Nematodes Flashcards
eggs are deposited and embryo develops outside the body
oviparous
viviparous nematode
c. philippinesis
parthenogenetic means?
produce eggs without male
example of parthegenetic
s. stercoralis
autoinfection possible w?
CES
c. philippinensis
E. vermicularis
S. Stercoralis
transimission thru inhalation
AE(american eagle)
Ascaris
Enterobius
has terminal mouth with 3 lips and sensory papillae
Ascaris
t or F? ascaris attach to intestinal wall?
False
reproductive potential of ascaris
240K eggs/day
ascaris with curves posterior end
male worm
types of eggs of ascaris
fertilized (corticated and decorticated;
unfertilized
fertilized = inner membrane of ascaris? middle? outer?
non permeable lipoidal vitellline;
glycogen layer;
outer - albuminoid/mammilated
decorticated means?
absent outer mamillated membrane
unfertilized eggs vs fertilized?
1st 2 layers absent ( inner and middle)
mamillated coating has what feature?
refractile granules
t or f? unfertilized eggs undergo further development in soil.
False, never.
t or f? when unfertilized eggs are ingested they can be infective
false
environemntal conditions for ascaris
moist, shaded, warm
allergic eosinophilic infiltration of lungs
loeffler
when ascaris enter the eustachian tube?
otitis media
severe colicky abdominal pain d/t migrating ascaris
biliary ascariasis
what form of ascaris causes gall stones ?
eggs
qualitative method of diagnosis
kato technique
advantages of kato katz?
RR, intensity, number of eggs
t or f? negative stool exam during larval migration via blood stream.
true (others: male, sexually immature)
where do ascaris worms develop into adult worms?
small intestines
community based chemotherapy of ascaris
every 4 months for 3 years
most common source of infection
soil contaminated food/raw vegetables
new world hookworm
necator americanus
cat hookworm
ancylostoma brazileinse
opposite curved posterior end
necator americanus
2 larval forms of hookwormss
rhabditiform and filariform
hookworm infective stage to man
filariform
inconspicious buccal spears of filariform
ancylostoma
t or f? differentiation of eggs of hookworms is easy.
false
N americanus requires this phase
transpulmonary phase
may also occur in the oral and transmammary routen
a. duodenale
a zoonotic infection cause by a. caninus and a. braziliense
cutaneous larva migrans
allowing for hatching of larval eggs to a filter paper
harada-mori
favorable for infection of hookworms
sandy loam type
96% of hookworm infecdtions
new world/ necator americanus
infection run parallel w hookworm infection
Strongyloides
short buccal lip w 4 indistinct lips
adult s. stercoralis
cochin china diarrhea
s. stercoralis
filariform s. stercoarlis infect the perianal area
external autoinfection
describe lesion of s. stercoralis
hemorrhagic papules
more fecally transmitted than oral
s. stercoralis
true or false? egg reduction rate cant be determined in stercoralis
true, only larvae is seen in stool
eggs are peanut shaped with straited shell and bipolar plug
capillaria
dse cause by capillaria
severe protein losing enteropathy; decreased xylose
pinworm inner membrane for?
chemical protection
true or falso? some eggs of pinworn can become air borne and get inhaled
true
3 forms of pathogenesis by pinworm
site of attachment of worm;
egg deposition in perianal area
migrating adults
pruritus ani d/t
eggs
vulvovaginitis and salpingitis d/t
migrating adults
diagnosis for e vermicularis
scotch tape swab
DOC for E vermicularis
pyrantel pamoate
no heart-lung migration
trichuris
what type of soil for trichuris?
clayish
