Atlas of livestock parasites
digitized collection of microscopical preparations

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Toxascaris leonina



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"roundworm"   In Czech: škrkavka šelmí  

Distribution: Worldwide.   

Host: Small intestine of dogs, cats, foxes, wild canids and felids. 

Life Cycle: The life cycle is similar to that of Toxocara spp., although there is no transmammary or transplacental infection. Dogs and cats are infected following ingestion of lembryonated and larvated eggs or paratenic hosts (rodents, rabbits). In dogs the pre-patent period is about 8 weeks and patent period 4-6 months.  In cats the pre-patent period is about 13 weeks and the patent period is 4-6 months.  

Diagnosis: Eggs are detected using centrifugal or simple fotation fecal examination techniques. Toxascaris eggs are elliptical with a thick, smooth outer shell wall containing a light-colored, single-celled embryo. The internal surface of the shell wall appears rough or wavy due to  the vitelline membrane.             

Size: 75–85 × 60–75 µm               

Clinical features: Toxascaris is much less common in dogs and cats than Toxocara and is  considered to be of minor clinical significance.   

Zoonosis: children are in greatest risk !


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