Worldwide occuring nematodes forming nodules in the mucosa of the bronchioles and trachea of canids. The transmission occurs direct from mother to puppy during care. The males reach a length of 6 mm, the females 12 mm. In cats O. rostratus is described. The prepatent period lasts 5–6 weeks. The symptoms of disease are chronical coughing.
Nematocidal Drugs (macrocyclic lactones).