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TRICHINELLA SPIRALIS

Trichinella spiralis

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parasitology trichinellosis trichinella cyst

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Page 1: Trichinella spiralis

TRICHINELLA SPIRALIS

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Ooh…PIG

Taenia soliumSarcocystis suihominis

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Ooh…PIGTaenia solium

Sarcocystis suihominis

Trichinella spiralis

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Trichinella spiralis

• Common name: Trichina worm

• Tissue nematode

• Cause: Trichinosis

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Trichinella spiralis

• Trichos – ella – spiralis

• Europe & America ; much less in tropics & Oriental countries

• In India- 1996-punjab

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Trichinella spiralis- Habitat

• Mucosa of small intestine of pig, rat, bear , & man

• Striated muscles- Encysted larvae

• No free-living forms

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Trichinella spiralis- Morphology

Claspers(Clasping papillae )

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Female

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Male Larvae

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Trichinella spiralis-Morphology

• Thin & pointed anterior half of body?

• Pair of Claspers at posterior end?

• Viviparous?

• Life span?

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Trichinella spiralis- Larvae

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Trichinella spiralis-Trichinella cyst

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Trichinella spiralis-Trichinella cyst

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Trichinella spiralis- cyst & larvae

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Trichinella spiralis-Trichinella cyst

• Shape?• Formed by?• Why preferentially in

diaphragm,biceps,muscles of jaw,extraocular muscles,neck & lower back?

• Position? Importance?• Fate?

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Trichinella spiralis-Life cycle

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Trichinella spiralis-Life cycle

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Trichinella spiralis-Life cycle

• How many host?• Man?• Infective form?• Mode of infection?• Nurse cell?

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Trichinella spiralis-Pathogenesis

• First stage

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Trichinella spiralis-Clinical features

• First stage

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Trichinella spiralis-Pathogenesis

• Second stage

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Trichinella spiralis-Clinical features

• Second stage

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Trichinella spiralis-Clinical features

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Trichinella spiralis-Pathogenesis

• Final stage

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Trichinella spiralis-Clinical features

• Final stage

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Trichinella spiralis-Diagnosis

DIRECT INDIRECT

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Trichinella spiralis-DiagnosisDIRECT METHODS

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Trichinella spiralis-DiagnosisINDIRECT METHODS

• HISTORY• Eating pork 2 weeks earlier• Recent –gasteroenteritis

• BLOOD EXAMINATION• Eosinophilia (20-95%)

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Serology

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Trichinella spiralis-DiagnosisINDIRECT METHODS

• SEROLOGY• Hypergammaglobinemia-IgE• ELISA-Confirmatory test: TSL-1 secreting

antigens

• Bentonite flocculation test• Latex fixation test

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Trichinella spiralis-DiagnosisINDIRECT METHODS

• Bachman intradermal test• 1:5000 or 1:10000 dilution of larval antigen• Wheel-15 to 20 minutes

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Trichinella spiralis-DiagnosisINDIRECT METHODS

• Radiological examination-calcified cysts• Molecular methods- PCR

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Trichinella spiralis-Treatment

• Mild cases: supportive treatment

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Trichinella spiralis-Treatment

• Moderate cases• Albendazole-BID• 8daysOr momendazole

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Trichinella spiralis-Treatment

• Severe cases• Add Glucocorticoids-Prednisolone

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Trichinella spiralis-Prophylaxis

COOK

kill

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Trichinella spiralis-Prophylaxis

No..!

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TRICHINELLA SPIRALIS- KEY POINTS

• Smallest nematode• Host- optimum & alternative• Viviparous• Infective form• Muscles commoly involved• Pathogenesis & clinical features• Diagnosis & treatment

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Thank you