Oesophagostomum species


Life Cycle

The preparasitic phase of Oesophagostomum is typically strongyloid, and infection is by ingestion of L3s. 

(or_da_ar.gif (344 bytes))  The L3s exsheath in the small intestine then enter the mucosa of any part of the small or large intestines. In some species (Oe. columbianum, Oe. quadrispinulatum and Oe. radiatum) L3s become enclosed in obvious nodules in which they moult to L4s .   These L4s then emerge on to the mucosal surface, migrate to the colon (A), and develop to the adult stage. 

The prepatent period is 32 to 45 days, depending on the species.  On reinfection with most species, the larvae may remain arrested as L4s, in nodules, for up to one year.

 

rbtn_pre.gif (1751 bytes) rbtn_nex.gif (1502 bytes)

rbtn_hom.gif (2447 bytes) rbtn_ind.gif (1976 bytes)

 

Parasites and Parasitic Diseases of Domestic Animals
Dr. Colin Johnstone (principal author)
Copyright 1998 University of Pennsylvania
This page was last modified on January 24, 2000