Nematodes (roundworms)

Question 1

strongyloides stercoralis

Answer 1

rhabditiform-filaiform-adult
cutaeneous reaction and allergic reaction at skin
pulmonary, intestinal symptoms
hyperinfection in immunosupressed leads to sepsis, ARDS
diagnose with rhabditiform larvae in stool

Question 2

necator americanus

ancylostoma duodenale

Answer 2

filiariform enters skin and carried to heart and lungs, break into alveoli, taken to intestines
itch, pneumonitis
IRON DEFICIENCY ANEMIA- sucks blood in the intestine has to be warm, moist climate in soil
eggs- thin shell, oval, round ends embryo in 8-16 cell stage

Question 3

Cutaneous infections nematodaes

Answer 3

strongyloides stercoralis
ancylostoma duodenale
necator americanus
get in feet from SANd!
you shit out rhabditiform larva that gets back into soil, where it develops into filariform

Question 4

Ingested infections nematodes

Answer 4

enterobius vermicularis
ascaris lumbrocoides
trichinella spiralis
don’t EAT that!

Question 5

enterobius vermicularis- pinworm

Answer 5

adult worm in intestine- female migrates to anus at night and lays eggs perianally
become infective in 4-6 hours
eggs hatch in duodenum and develop in 10-30 days
cannot diagnose in stool, need scotch tape test with eggs clear and flattened on one side

Question 6

ascaris lumbrocoides

Answer 6

adult worms in intestine, eggs passed in feces, larvae hatch from egg after ingestion and penetrate the gut
blood-liver-lung-esophagus-swallowed-adult
clin- pneumonitis, bowel obstruction
adults 30-40 cm, eggs oval to elongate with bumpy shell
diagnose with eggs or adults in stool

Question 7

Toxocara canis

Answer 7

food contaminated with eggs- visceral larva migrans, causes granulomas in retina, mimics rb