Heligmosomoides polygyrus

January 27, 2012 § 2 Comments

Heligmosomoides polygyrus

Preliminary sketch for drawing to measure 1.5m x 1.5m.

Heligmosomoides polygyrus is a common nematode found in the duodenum and small intestine of woodmice and other rodents. It is often used to model human helminth infection in laboratory mice.

These worms are 5–20mm in length and bright red due to the pigmentation of their tissues. They are usually heavily coiled, with the female having 12–15 coils and the male 8–12. The male can be distinguished from the female by a prominent copulatory bursa and two long, thin spicules at the posterior end.

They have a direct life cycle. The eggs pass out with the faeces of the host into the environment. After 2 days they hatch as larvae which are about 300μm in length. The larvae moult 3 days later but retain the shed cuticle for protection. It is at this point they become infective. The larvae shed the outer protective sheath after they are eaten by a suitable host. The larvae then penetrate the submucosa of the duodenum where they undergo 2 further moults. About 7 days later the male and female adult worms emerge into the lumen of the duodenum where they attach to the epithelial layer and begin to feed off the contents of the gut. The adult worms mate and eggs are shed in the faeces. The complete life cycle from egg to egg takes a minimum of 15 days, and the female worms will live inside their host for 8 months.

These worms often form cysts in the wall of the intestine. These cysts often become infected with bacteria, but it is not yet known if these are harmful to the host.

This nematode has been previously called Nematospiroides dubius.



§ 2 Responses to Heligmosomoides polygyrus

  • dianabuja says:

    Reblogged this on Dianabuja's Blog and commented:
    A simple, accurate explanation – the life cycle of internal parasites. Vary by type, of course, but the basic cycle is the same: both for humans and other animals.

  • David Omagbe Oshadu says:

    I like this! I’m particularly interested in this parasite because I’m a postgraduate student in Nigeria, working with it. It’s an in vivo study, evaluating anthelmintic effect of a particular plant extract. I’ll be glad for every useful material that could be sent to me. I appreciate the information on this page. Thank you.

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