Nodule worm (Oesophagostomum columbianum) is a parasite of the large intestine of sheep and goats.

This parasite was once ranked second only to barber’s pole worm (Haemonchus contortus) in summer rainfall areas (northern NSW, southern Queensland).

Its prevalence has decreased considerably since the 1960s with the advent of modern anthelmintics and the increase in the amount of improved pastures (Cole, 1986).

It can still cause losses to meat processors, however, with condemnation of ‘sheep runners’ (intestines) due to ‘pimply gut’ caused by migrating nodule worm larvae.

This Primefact covers the following topics:

• Life cycle and effects
• Significance
• Control and prevention
• References and further reading