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24 Cards in this Set
- Front
- Back
What organisms make up the blood and tissue nematodes?
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-Trichinella spiralis (Trichina Worm)
-Wuchereria bancrofti -Brugia malayi -Loa Loa -Onchocerca volvulus |
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Infective stage of Trichinella spiralis?
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ingestion of encysted larvae in undercooked pork
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Diagnostic stage of Trichinella spiralis?
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Muscle biopsy showing encysted larvae in striated muscle.
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Adult females of Trichinella spiralis bear _________?
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larvae instead of eggs
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Microfilariae require ____________ as an intermediate host
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arthropod
*when arthropod takes blood meal, mircofilariae are released into human host* |
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Diagnose microfilariae by examining ________
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Giemsa stained thick and thin smears
*Except Onchocerca volvulus (skin scraping from nodules)* |
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How many nuclei are in the tip of the tail of Wuchereria bancrofti?
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none.
Sheathed |
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Wuchereria bancrofti has __________ periodicity?
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Nocturnal
10pm-4am=greatest concentration in blood |
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Elephantiasis is caused by ___________?
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Wuchereria bancrofti
*permanent blockage of lymphatic system-lower extremities and genitalia* |
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Diagnose Wuchereria bancrofti?
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blood smear
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The microfilaria of Brugia malayi has ___ nuclei at tip of tail?
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2 nuclei at tip of tail.
*separate from rest of body nuclei *sheathed *nocturnal periodicity |
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Brugia malayi causes _____ of the lower extremities?
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Elphantiasis
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The microfilaria of Loa Loa have _____ pattern of nuclei?
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nuclei to the tip of the tail
*sheathed |
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Loa Loa have ________ periodicity?
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diurnal
*10am-4pm=greatest concentration in blood |
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Calabar swelling (allergic reaction to worm migration in tissue) is caused by?
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Loa Loa (eye worm)
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Diagnose Loa Loa by....
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-blood smear
-migration across conjunctiva |
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Onchocerca volvulus microfilaria have how many nuclei in tail?
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none
-Only pathogenic microfilaria NOT sheathed! -NO nuclei in tip of tail |
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Where are microfilaria of Onchocerca volvulus found?
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In nodules under the skin
NOT in peripheral blood |
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Onchocerca volvulus causes...
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-Severe dermatitis (eosinophilia 50-70%)
-blindness (leading cause of blindness in Africa) |
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Diagnose Onchocerca volvulus by ___________.
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Tissue scrapings
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Vector of Wuchereria bancrofti?
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Mosquito
(Culex & Anoheles) |
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Vector of Brugia malayi?
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Mosquito
(Mansonia) |
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Vector of Loa Loa?
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Fly (Chrysops)
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Vector of Onchocerca volvulus?
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Fly (Simulian)
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