Phylum Nematoda (Ascaris sp. )

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GALLERY 

ASCARIS SP. 










INTERESTING FACTS 
  • Ascaris lumbricoides is a soil-transmitted helminth (parasitic) worm.
  •  It is common in tropical and sub-tropical regions and causes a disease called ascariasis.People become infected when they ingest worm eggs from soil.
  • It lives and reproduces inside its human host.
  • The worm cleverly works its way through the body from the gut, via the liver and heart, to the lungs and back to the gut.
  • Symptoms of the disease vary, and some people don’t even realise they are infected (they are 'asymptomatic').People infected with multiple worms experience diarrhoea, abdominal pain, general malaise and weakness. These symptoms can affect people’s ability to work and learn, and can impair physical growth.
  • Size Ascaris worms are very long. Adult females grow up to half a metre long, and males are15–31cm in length. They vary in diameter from 2–6mm

  • Life cycle


·         ingested Ascaris eggs hatch out into larval worms in the intestine
·         worms pass through the intestine wall into the bloodstream
·         worms travel via the liver and heart into the lungs
·         after 3 weeks they are coughed up, swallowed and return to the gut
·         male and female worms mate and female worm produces eggs
·         eggs pass out in the stool and become infectious after 2 weeks in the soil

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