Parasitology Flashcards
Where do round worms multiply?
outside the host
Describe the life cycle of the pin worm
eggs are ingested
larvae hatch in the small intestine
adults mature in the cecum
eggs laid on perianal folds
How long can eggs of pinworms live in the environment?
for two weeks
How do you treat pin worm?
Mebendazole. Treat for 2 cycles, with two weeks in between
How does a pt with strongyloides present?
A patient on steroid therapy suddenly has GI sx with nausea/weight loss/abdominal sx
-symptomology similar also to asthma/pneumonia with wheezing
Most often infection is SILENT
Does strongyloids need the host to complete its life cycle?
NO. Can live on its own in the soil
What is the diagnostic form of strongyloides?
larvae in the stool
Describe how strongyloides travels through the body
1. Skin 2 veins 3. pulmonary system 4. swallowed-->GI 5. Hyperinfection--disseminated
–>The worm CAN multiply in the host!
How big are strongyloides?
Only a couple mm long
How big is ascaris?
35 cm!
Describe the life cycle of ascaris
Egg swallowed
Mate in bowel and produce eggs
Worm does NOT multiply in host. You’ve gotta eat a lot of eggs!
How does ascaris present?
Usually asymptomatic. BUT can cause bowel obstruction.
What is the diagnostic stage of ascaris?
Stool sample shows ascaris egg
How do you treat ascaris?
Treat with piperazine
What worm causes visceral larva migrans?
dog/cat ascaris
