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QuestionAnswer
Trichinella spiralis common name Trichina worm
Trichinella spiralis lifecycle undercooked striated muscle; no egg stage; live larvae layed; infant larvae enter blood stream, travel to striated muscle to encyst
nurse cell striated muscle that surrounds coiled larva of Trichinella spiralis
Trichinella worms male has curved posterior end w/ 2 rounded apendages(walrus); female has blunt, rounded posterior end
Trichinosis/Trichinellosis worldwide; infection of Trichinella spiralis; 'Great Pretender'-mimics symptoms of other diseases; splinter hemorrhages under nails, under eye edema
Dracunculus medinensis common name Guinea worm
Dracunculus medinensis lifecycle ingestion of contaminated drinking water w/ infected copepods; copepods die, release larvae, mature to adult, reproduce in stomach/intestinal wall; gravid female migrates to skin, deposits larvae, causing ulcer; ulcer exposed to cool water, ruptures
Dracunculus medinensis reservoir dogs that drink contaminated water
Wuchereria bancrofti common name Bancroft's filariae
Wuchereria bancrofti intermediate host/vector culex, aedes, anopheles mosquitos
Wuchereria bancrofti microfilariae thin, delicate sheath surrounds; numerous nuclei 3/4 of way
Wuchereria bancrofti found in sub-tropics and tropics; infects lymphatics and can cause Elephantiasis
Brugia malayi differientiation from W. bancrofti microfilaria tapered tail has subterminal and terminal nuclei
Loa loa vector Chrysops (deer) fly
Loa loa lifecycle reside and multiply in subcutaneous tissue; microfilariae present in blood
Loa loa microfilariae sheathed w/ continuous nuclei throughout
Loiasis infection of Loa loa; adult worm migrates across eye/bridge of nose; Calabar swellings
Loa loa epidemiology Africa, Sudan, W.Africa, Congo, Nigeria
Onchocerca volvuslus vector Simulium blackfly
Onchocerca volvuslus microfialriae/adult doesn't have sheath/ thin wirelike, typically coiled in knots insided infected nodules
River Blindness aka Onchocerciasis; infection of Onchocerca volvuslus
Mansonella perstans/ ozzardi lifecycle Culicoide/sucking midge(fly) or Simulium/blackfly; from blood to body cavities where adults reside
Mansonella perstans/ ozzardi microfilariae no sheath, nuclei almost full length
Taenia saginata/ solium lifecycle (tapeworm)ingestion of raw/undercooked beef/pork contaminated w/ cysticercus larva; adult attaches to sm. intestine w/ scolex
Taenia saginata adult worm scolex has 4 suckers, lacks rostellum and rows of hooks
Taenia solium adult worm scolex has 4 suckers, rostellum and rows of hooks
Hymenolepis diminuta common name Rat Tapeworm; primarily a rat parasite
Hymenolepis diminuta egg embryo contains 3 pairs of hooks; polar thickenings
Hymenolepis diminuta adult scolex has 4 suckers, rostellum w/ no hooks; proglottids are short and wide
Humenolepiasis aka Rat Tapeworm disease; infection of Hymenolepis diminuta; mild symptoms
Hymenolepis nana common name 'Dwarf Tapeworm'
Hymenolepis nana auto re-infection may occur if egg remains in human and hatches in GI tract
Hymenolepis nana egg central hexacanth embryo w/ 3 pairs of hooklets; shell has polar thickening, polar filaments
Hymenolepis nana adult worm scolex has 4 suckers, short rostellum, 1 row of hooks, proglotids short and wide
Hymenolepiasis aka Dwarf Tapeworm disease; caused by Hymenolepis nana
Dipylidium caninum common name dog/cat tapeworm or pumpkin seed tapeworm
Dipylidium caninum lifecycle from ingestion of dog/cat flea with infective larvae inside; humans take place of dog/cat in cycle; attach in intestine
Dipylidium caninum egg packets contains 5-30 eggs; from 'pumpkin seed' proglottid
Dipylidium caninum adult worm scolex has 4 suckers, club-shaped rostellum containing 1-7 circlets/spines instead of hooks
Created by: cjbarnes78