filariasis nematoda systemic round worms - bangabasi...
TRANSCRIPT
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Filariasis
NematodaSystemic round worms
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Filaria-a roundworm
-Adult filaria live in body cavities, lymphatics, and subcutaneous tissues
-embryos (microfilaria) live in blood or dermis
-all require an insect or crustaean vector
-microfilaria (150-350 µ long)
- adults 2 cm – 120 cm (4 – 10 µ wide)
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Filaria
1. Onchocerca volvulus - river blindness - black fly
2. Wuchereria bancrofti - lymphatic filariasis - mosquitoBrugia malayi
3. Loa Loa - eye worm - deer fly
4. Dracunculus medinensis - Guinea worm - cyclops
5. Mansonella perstans - midge
6. Mansonella ozzardi - midge
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Wuchereria bancrofti and Brugia malayi
lymphatic filariasiselephantiasis
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Lymphatic filariasis Wuchereria bancroftiBrugia malayi
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Lymphatic filariasisWuchereria bancrofti and Brugia malayi
- vector - mosquito (Culex, Anopheles)
- adult - in lymphatics length 4-10 cm.
-microfiliaria - in blood - 150-350 µ long - 4 – 10 µ wide
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Wuchereria Chengmai
OnchocercaLoa
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Clinical states of Wuchereria bancrofti1. assymptomatic2. inflammatory - lymphangitis - arms 25%
- legs 11%- epididimitis, funiculitis 42%- ‘filarial fevers’- orchitis- filarial abscess
3. Obstructive - elephantiasis- chyluria- hydrocoele
4. Tropical pulmonary eosinophilia
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blood microfilaria
1 – direct examination (thick or thin smear)
2 – Knotts concentration technique
3 – millipore filtration
4 – antigen capture
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Loa loa
“eye worm”
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Loa loa (eye worm)
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Crysops (Loa loa vector)
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Calabar swelling
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Calabar swelling
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Loa loa adult in Calabar swelling x section
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Loa loa (the “eye worm”)
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Loa loa microfilaria
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Onchocerca volvulus
“River blindness”
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Simulium damnosum
The “black fly”
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Onchocerca nodule
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X section of Onchocercal nodule
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Skin snips for microfilaria with oculoscleral biopsy forceps
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Onchocerca microfilaria from a skin snip
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Anterior chamber microfilaria and keratic precipitates
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Kingdom Animalia
Subkingdom Protozoa
Phylum Sarcomastigophora
Phylum Apicomplexa
Phylum Ciliophora
Phylum Microspora
Subkingdom Metazoa
Phylum Nematoda
Phylum Platyhelminthes cestodes (tapeworms)
trematodes (flukes)
Taxonomy
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Trematodes
“flukes”
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Trematodes = flatworms
watercresshuman (liver)Fasciola
freshwater crabs, cray fishhuman (lung)Paragonimus
freshwater fishhuman (liver)Opisthorchis
waterhuman (blood)Schistosoma
Source (cercaria/metacercaria)adult
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hermaphroditicliver flukes, lung flukes etc.
two sexesblood flukes
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Humanadult ~5-8 yrs)
Schistosoma life cycle
Egg (~21 days in tissue)
SnailRedia/sporocysts (~6 wks)
Miracidium (~10 hrs)
Cercaria ~2 days)
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Schistosomiasis (blood flukes)
Schistosoma mansoniSchistosoma hematobiumSchistosoma japonicum
etc.
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S. hematobium S. mansoni S. japonicum
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swimmingciliated miracidium
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Swimming cercaria
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Clinical Presentation of schistosomiasis
Intestinal
S. mansoni
S. japonicum
S. intercalatum
S. mekongi
Urinary
S. hematobium
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Geographic distribution
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Chronic Intestinal Schistosomiasis
portal hypertension with splenomegalyoesophagial variceshypersplenismascitis
pulmonary hypertension
CNS lesions: spine - transverse myelitiscerebral – seizures (S. japonicum)
intestinal polyposis: both sessile and pedunculated
chronic salmonellosis
intestinal granulomatosis: contractures of colon, intusseception
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Urinary schistosomiasis
Schistosoma haematobium
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Schistosoma near urethra
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Schistosoma hematobiumPresentation
hematuria (terminal)urinary frequencypyuriapyelonephritisobstructive uropathycancer of bladder (squamous cell)distant metastases (spinal column)
(pulmonary hypertension)
Laboratorydebris in urineeggs in urine (overnight-millipore)I.V.P. abnormalitiescystoscopyserology
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Diagnosis: intestinal schistosomiasis
1. History of freshwater exposure2. Stool for O&P (egg counts and viability)3. Serology-- Elisa and Western Blot4. Antigen capture5. Eosinophilia6. Rectal snips or biopsies7. Liver biopsy8. Ultrasound or CT of abdomen
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Treatment of Schistosomiasis
praziquantel
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Schistosoma japonicum is a zoonosis