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parasites2
Question | Answer |
---|---|
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 |