Ascaris lumbricoides

 

The largest intestinal parasite of man with a length of about 40cm. It is a nematode worm. The adult worm is is found in the intestine where it lives in its lumen and produces about 240,000 eggs per day which passes into feces where it is transmitted by feco-oral method. The larvae are hatched in the intestine after the ova are swallowed and they migrate into the blood stream where they reach the lung and alveoli. From there they are aspirated and swallowed to enter the intestine and establish parasitic life. They may cause pneumonitis in the lungs in view of their migration and /or minor gastrointestinal discomfort but in most case are asymptomatic. In children they ay block the intestine to cause intestinal obstruction or biliary tree occlusion.

 

 

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