Atlas of livestock parasites
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Crenosoma vulpis (dog)



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"fox lungworm"    

Distribution: Northeastern North America and Europe.    

Host: Bronchioles, bronchi, and trachea of dogs, foxes, and various wild  carnivores.        

Life Cycle: Canid defnitive hosts are infected by oraly, ingestion of slug/terrestrial snail intermediate hosts containing third-stage larvae. Larvae produced in the respiratory system by adult worms are coughed up, swallowed, and passed from the host in feces.  Pre-patent period is 3 weeks, patent period is up to 10 months.    

Diagnosis: Detection of frst-stage larvae in feces using the Baermann technique or bronchial lavage fluid by Baermann method or microscopic detection in bronchial lavage material. First-stage larvae tend to assume a C shape when they are killed by gentle heat or iodine. The terminus of the tail has a slight defection but does not show the kink and spine seen in other nematode lungworms.        

Size: 264–340 × 16–22 µm          

Clinical features: infection in dogs produces a nonfatal chronic cough. Canine infection is not generally rare in the Atlantic Canadian provinces, where crenosomosis is a frequent cause of chronic respiratory disease.   


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