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General issues of Vaccine
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General issues of Tropical med.
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General issues of Travel med.
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Trematode (fluke, distoma)
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Ascaris lumbricoides
- ovo ingested via mouth
- hatch in duodenum
- penetrate intestinal wall thru portal vein to liver
- migrate into biliary duct
- invade liver
- migrate to lung thru venous circulation
- Löffler's syndrome
- again migrate to intestine thru trachea and esophagus
- egg under microscopy has thick hard wall because it needs to hatch 6-8weeks in soil
- infertile egg has bumpy shaped wall
Intermediate host
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Category
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(soil-transmitted)
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Latin
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Inward infection
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(egg contained in host feces)
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Organ
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Reproduction
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(embryonated in soil)
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Course
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(only fertilized egg embyonated with L3 larva)
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Detection
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Outward transmission
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{{{outward}}}
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Definitive host
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Category
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human
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Latin
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Inward infection
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ingestion of embryonated egg contaminated food
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Organ
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duodenum→lung→esophagus→intestine
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Reproduction
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sexual
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Course
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- ingested embryonated eggs hatch in duodenum
- larvae penetrate duodenum wall and enter circulation
- migrate to lungs via circulation
- Löeffler syndrome may occur
- migrate trachea to esophagus
- reach intestine and differentiate males and females
- females produce 200,000 egg everyday
- eggs excreted by defecation
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Detection
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egg microscopy of feces
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Outward transmission
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{{{outward}}}
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