Atlas of livestock parasites
digitized collection of microscopical preparations

Atlas of Parasites Contents Information sources Glossary Administration

Baylisascaris procyonis (dog, cat)



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Nematode (order Ascaridida)         

"raccoon roundworm"               

Distribution: Parts of North America and Europe.  

Host: Small intestine of raccoons and occasionally dogs.      

Life Cycle: Raccoons are infected by ingestion of infective eggs or paratenic hosts (rodents, rabbits, birds). Routes of infection in dogs are presumed to be the same.         

Diagnosis: Eggs are detected by simple or centrifugal fecal fotation examination.  Eggs are thick walled, elliptical in shape, and contain a single, large, round-celled embryo. The eggs are often covered with a brown proteinaceous substance and have a fne granular shell wall       surface.              

Size: 63–75 × 53–60 µm               

Clinical features: Infection is well tolerated in the raccoon defnitive host. Severe central  nervous system or ocular disease can result from exposure of birds, rabbits, rodents, marsupials, and humans to infective B. procyonis eggs. Infections in dogs may result in either patent adult worms in the small intestine or larval tissue migration causing central nervous system disease.              


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