Glossary of E.vermicularis and T. trichiuris
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- what are the first two roundworms and what is similar about them?
- Enterobius vermicularis and Trichuris trichiura
-have similar life cycles.
- how do e. vermicularis and t. trichiura enter humans?
- -ova in environment
-get eaten by humans
- what happens after embryonated ova are eaten?
- -larvae hatch in sm. intestine
-adults develop in large intest
life cycle varies here.
- at what point do the life cycles similarities end between e. vermic and t. trichiu?
- after the adults fertilize in the large intestine.
- What happens after fertilization in
- Males die in intestine
-Female (gravid) migrates to the perianal area, lays her ova,
ova get into environment and start over.
- what happens after fertilization in
- -ova are laid in the intestine
-ova are passed in feces, get out into the environment.
- what is the infectious stage of e. vermicularis/t. trichiura?
what is the transmission mode?
- -the embryonated stage
-transm. is by ingestion of embryonated ova
- what disease does e. vermicularis cause?
2 common names for it:
where is it?
in what host(s)
Pinworm or Seatworm
- how big are the adult females of e. vermicularis?
- females: 10 by .5 mm
ovum: about 55 by 25
- what are the things at the end of the esophagus in e. vermic?
- alar expansions
- what surrounds the e. vermic ovum?
- thick hyaline membrane
- what are 3 symptoms of e. vermicularis?
- how is e. vermicularis diagnosed?
- do a scotch tape prep 3x
mostly found on kids anyway
- how is e. vermicularis treated
-but it only kills adults so take over 3 wk period; treat the whole fam - it's like lice in the butt
- what's a variation of the life cycle that e. vermic can do?
- auto-infection: larva hatch while still in perianal area and move right back up into intestine
- what disease is caused by t. trichiura?
-whats a common name for it?
-where is it found?
-what is the host of it?
-in subtropic climates, not arid
-humans, more kids than adults
- how long are t. trichiura
- females: 40 mm long
ovum: 50 x 25 u
- what's unique about how t. trichiura adults act in the intestine?
- imbed their anterior into mucosa; posterior hangs free.
-female butt fills with eggs
-male butt coils
-both stay attached (male until he dies), so won't see on fecal specimen.
- what are 4 distinguishing charact of t. trichiura ovum?
- -football shaped
-bile-stained from passing thru the intestine.
-polar plugs of mucus
-thick outer wall.
- what stage of t. trichiuris is best for diagnosis?
- the FECAL STAGE
- what are the usual symptoms of t. trichiura?
- -abdominal pain
- what are 2 symptoms of chronic trichiuriasis?
why would you have this?
the female doesn't die, keeps producing eggs.
- if t. trichiura is suspected, what tests would you run?
- O and P and a Parasite test.
- what is the diagnostic basis for id of t. trichiura?
- characteristic ova in stool
- how is t. trichiura treated?
- Mebendazole or
- How can it be prevented?
- good hygiene, wash fruits/veg
properly dispose feces
don't use night soil - human manure.
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