Atlas of livestock parasites
digitized collection of microscopical preparations

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Oslerus osleri (dog)



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Distribution: Worldwide.     

Host: Infecting foxes and dogs – direct oral transmission from bitches to pups.  Pre-patent period is 10 weeks and the patent period is unknown. Lumenal nodules in the tracheal bifurcation in dogs, coyotes, wolves, dingoes, and foxes.    

Life Cycle: Infection follows ingestion of frst-stage larvae from sputum or vomitus of an infected dog or other canid. This life cycle varies from that of other strongylid lungworms because the first larval stage is infective for the defnitive host. Typically, the third larval stage is the infective form.

Diagnosis: Detection of live larvae in fresh faeces using the Baermann method or by microscopic detection of larvae in bronchial lavage material.  Adult worms inhabit nodules at the base of the trachea – these may be seen on radiography or endoscopy. 

Size: 232–266 µm  Larvae recovered from feces                

Size: 325–378 µm  Larvae recovered from trachea     

Clinical features: Respiratory symptoms, coughing and possibly exercise intolerance. Younger animals tend to be more severely affected than older ones. Respiratory distress, chronic cough, and weight loss can occur. Heavily infected animals may die.     



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