Nematodes Flashcards
Enterobius Vermicularis common name
pin worm
trichuris trichiura common name
whipworms
strongyloides stercoralis common name
threadworms
dracunculus medinensis common name
guinea worm
Where is enterobius vermicularis commonly found
daycare or pediatric areas
enterobius vermicularis dx phase
eggs on perianal folds
enterobius vermicularis infective phase
embryonated cells ingested
enterobius vermicularis size
invisible to naked eye
where do adult enterobius vermicularis live in the body?
lumen of the cecum
ascaris lumbricoides dx phase
3, fertilized/unfertilized egg from feces, adults in small intestine, or larvae in spit
ascaris lumbricoides infective stage
ingestion of eggs usually from water
where is ascaris lumbricoides common?
the global south
ascaris lumbricoides eggs are
cordicated or deocordicated
where can ascaris lumbricoides travel to in the human body
lungs
trichuris trichiura dx phase
feces
trichuris trichiura eggs are
highland plugs on either end
trichuris trichiura infective phase
ingestion of eggs
where does trichuris trichiura live in the human body
cecum
strongyloides stercoralis dx phase
feces or blood
strongyloides stercoralis infective phase
penetrate skin and travel to mucisa of small intenstine
strongyloides stercoralis can often be confused with _____ but has a ____ buccal cavity and is ____ severe
hookworms, shorter, more
causes hyperinfection
strongyloides stercoralis
toxocara spp dx phase
consumption of eggs
toxocara spp infective phase
bx or observation
toxocara spp definitive host is
cats and dogs
toxocara spp eggs are
not produced in humans
symptoms of toxocara spp.
ocular migrans and cutaneous larva migrans
wuchereria bancrofti dx phase
sheathed with no nuclei in blood/lymph
wuchereria bancrofti infective phase
larvae enter skin and moves to lymphatic system
wuchereria bancrofti vector
mosquito
loa loa vector
chrysops fly
loa loa dx phase
sheath and nuclei at tip of tail in CSF, urine, sputum, or peripheral blood
loa loa infective phase
larvae
common time to find microfilariae from loa loa to be seen on blood smears
10 am to 2 pm
onchocerca volvulus causes
river blindness
onchocerca volvulus dx phase
no sheath, no nuclei in skin and lymph of connective tissue
onchocerca volvulus infective phase
larvae from fly bite
onchocerca volvulus vector
simulium/ african black fly
calabar swelling
onchocerca volvulus
dracunculus medinensis infective phase
ingesting fleas w/ larvae
dracunculus medinensis diagnostic phase
worms emerging from blister
dracunculus medinensis vector
water flea
worm burst through foot and infects water, increasing infection
dracunculus medinensis
trichinella spiralis dx
encysted larvae in muscle (bx)
trichinella spiralis infective phase
larvae from ingestion of undercooked meat
symptoms of trichinella spiralis
edema around eyes, Hf, splintered nails
necator americanus AKA
new world hookworm
necator americanus dx phase
eggs in feces
necator americanus infective phase
filariform larvae penetrating skin
ancylostoma duodenale AKA
old worm hookworm
ancylostoma duodenale dx phase
eggs in feces
ancylostoma duodenale infective phase
filariform larvae penetrates skin
symptoms of hookworms
anemia/severe blood loss
necator americanus/ ancylostoma duodenale treatment is
identical