Ascariasis

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Ascaris lumbricoides

• "roundworm" 回虫

1. ovo ingested via mouth
2. hatch in duodenum
3. penetrate intestinal wall thru portal vein to liver
   1. migrate into biliary duct
   2. invade liver
4. migrate to lung thru venous circulation
   1. Löffler's syndrome
5. 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
Category	(soil-transmitted)
Latin
Inward infection	(egg contained in host feces)
Organ
Reproduction	(embryonated in soil)
Course	(only fertilized egg embyonated with L3 larva)
Detection
Outward transmission	{{{outward}}}

Definitive host
Category	human
Latin
Inward infection	ingestion of embryonated egg contaminated food
Organ	duodenum→lung→esophagus→intestine
Reproduction	sexual
Course	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
Detection	egg microscopy of feces
Outward transmission	{{{outward}}}