Ascaris lumbricoides

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Ascaris lumbricoides is a common human roundworm with an adult up to 30cm that infects approximately 1.5 billion people globally. Infection in females is associated with increased fertility. Complications can be serious such as intestinal obstruction[1], volvulus, intussusception, and intestinal necrosis.


  • Superkingdom Eukaryota
    • Kingdom Metazoa (Animalia)
      • Subkingdom Bilateria
        • Clade Protostomia
          • Superphylum Ecdysozoa
            • Phylum Nematoda
              • Class Chromadorea
                • Order Ascaridida
                  • Superfamily Ascaridoidea
                    • Family Ascarididae
                      • Genus Ascaris
                        • Species Ascaris lumbricoides

Human cycle

It is a soil-transmitted helminth. The infecting eggs hatch into larvae in the duodenum from which they enter the circulation to the liver and lungs six to 8 days later. The alveolar membrane is then broken through, the worms are expectorated and re-enter the intestinal tract by the 10th day where they mature into adults with subsequent oral, nasal, or anal passage. Sexual maturity is reached about 24 days, with the female producing 200,000 eggs daily.