Changes

The adult worms are found in the trachea and the bronchi.  The female lays embryonated eggs, which are later coughed up and swallowed.  The eggs hatch during the passage through the intestinal system.  First stage larvae are passed in the faeces of the host.  Development into L2, and later L3, occurs within the faeces on the pasture.   

The adult worms are found in the trachea and the bronchi.  The female lays embryonated eggs, which are later coughed up and swallowed.  The eggs hatch during the passage through the intestinal system.  First stage larvae are passed in the faeces of the host.  Development into L2, and later L3, occurs within the faeces on the pasture.   

A new host is infected by ingestion of infective larvae whilst grazing.  These infective larvae are passed through the alimentary tract, where they penetrate the wall of the ingestine.  The larvae then migrate to the lungs, via the lymphatic system, or the blood circulation.  These ascend the respiratory tree, where they mature into adult lungworms.

A new host is infected by ingestion of infective larvae whilst grazing.  These infective larvae are passed through the alimentary tract, where they penetrate the wall of the intestine.  The larvae then migrate to the lungs, via the lymphatic system, or the blood circulation.  These ascend the respiratory tree, where they mature into adult lungworms.

The prepatent period is 3.5 weeks.

The prepatent period is 3.5 weeks.