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Trichinella spiralis
• Commonname:Trichinaworm
• Diseasecaused:Trichinosis,Trichiniasis
• Adultwormisminute
• Femaleviviparousorlarviparous andiscapableofproducing1,500larvae
• Smallestnematodeparasiteofhumans
Lifecycle
• Encystedlarvaeinpigmuscle
• Ingestionofimproperlycookedpork
• Infectedflesh isdigestedbygastricjuice
• Adultsintheduodenum
• Larviparous femaleburrowsintomucosaanddeposit larvae
• Larvaeentersthecirculation
• Encystinstriatedmuscle
• Deadendcycle
Pathology
• Incubationandintestinalinvasion• Includesdiarrhrea,constipation, vomitingabdominal cramps,nausea
• Larvalmigrationmuscleinvasion• Fever,painandswelling,weakness• Splenomegaly, gastricandintestinalhemorrhages
• Encysment andencapsulation• Fever,weak,pain
Preventionandcontrol
• Cookmeat77C177F• Freezing- - 15Cfor20daysor-30Cfor6days• Smoking,salting,ordryingisnoteffective
Enterobius vermicularis
• Pinwormorseatworm
• Enterobiasis oroxyuriasis
• Adults• Smallwhitishorbrownincolor• Male- 2-5mmcoiledtailend• Female- 8-13mmpointedtailend
Ova
• Elongated• 50-80by20-30microns• Flattenedlateralside,lopsidedD• Twoegg-shelllayer• Albuminous layer- outer• Embryonicorlipoidalmembrane- inner
• Resistanttodisinfectant• Underfavorablecondition,itremainsviablefor13days
Lifecycle
• Adultsinthecaecum
• Gravidfemalesmigratetotheperianalareatodepositembryonatedegg
• Ovaareinfective toman6hrsafterdeposition
• Ovaareingestedorinhaledbyman
• Larvaehatchintheduodenum
• Migratetoitsfinalhabitatinthelargeintestine
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