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28 terms

filarial Nematode

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Inhabit lymphatics, subcutaneous or deep connective tissues as ADULTS
Filarial Nematodes
Adult female produces MICROFILARIAE (larva stage)
Filarial Nematodes
Infections acquired from bite of arthropod vector
Filarial Nematodes
Thread-like, highly motile
Microfilariae
Found in peripheral blood or tissues
Microfilariae
May be sheathed or unsheathed
Microfilariae
Contain body nuclei
Microfilariae
May exhibit periodicity in circulation
Microfilariae
Presumptive: Clinical evidence within an endemic area
Filarial Nematodes
Definitive: Detection of microfilariae in blood or tissues
Filarial Nematodes
Specimen stained with Giemsa or hematoxylin-based stain
Filarial Nematodes
Wuchereria bancrofti
Filarial Nematodes
Tropics & Subtropics
Wuchereria bancrofti
Microfilariae: Found in blood; nocturnal periodicity; sheathed, body nuclei do not extend to tip of tail
Wuchereria bancrofti
Elephantiasis - inflammation & obstruction of lymphatic system (involves extremities & external genitalia)
Wuchereria bancrofti
Microfiliariae: Found in blood; nocturnal periodicity; sheathed; two terminal nuclei at tip of tail (separate from rest of body nuclei)
Brugia malayi
Tropics & Subtropics
Brugia malayi
If elephantiasis is seen, usually in lower extremities only
Brugia malayi
Common name: African Eye Worm
Loa Loa
West & Central Africa
Loa Loa
Microfilariae: Found in blood; diurnal periodicity; sheathed; body nuclei continuous to tip of tail
Loa Loa
Calabar swellings - localized subcutaneous edema (on extremities
Loa Loa
Migration of adults usually not painful
Loa Loa
Seldom noticed unless worm passes over bridge of nose or through conjunctiva of eye
Loa
Central Africa, Saudi Arabia, Mexico & Brazil
Onchocerca volvulus
Microfilariae: Found in SKIN; nonperiodic; unsheathed; body nuclei do not extend to tip of tail
Onchocerca volvulus
Onchocercomas - subcutaneous nodules containing encapsulated adult
Onchocerca volvulus
Onchocerciasis (River Blindness) - ocular lesions leading to blindness
Onchocerca volvulus