Parasitic Bronchitis in Cattle

Lungworm, Husk, Hoose, Parasitic Bronchitis: there are many names for the disease caused by the nematode worm Dictyocaulus viviparous. Infective larvae on pasture are ingested, migrate to the lungs and enter the main airways. The presence of large numbers of worms obstructing the airways causes the symptoms in affected cattle. The parasite’s lifecycle is similar to that of gut roundworms and most cases occur in late summer / autumn.