Atlas of livestock parasites
digitized collection of microscopical preparations

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Alaria alata



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Distribution: Worldwide  

Host: Small intestine of dogs, cats, and various wild carnivores.       

Life Cycle: Eggs are passed in the feces of the mammalian host. Following larval development in a snail intermediate host, a second intermediate host (frog) is infected. Infection of dogs and cats occurs by ingestion of frogs or various paratenic hosts harboring the larval stage (mesocercaria). Transmammary transmission has been reported in cats.            

Diagnosis: The most reliable method is detection of eggs by sedimentation examination of feces, although sometimes eggs may be detected on fecal fotation.     

Size: 98–134 × 62–68 µm             

Clinical features: Infections are generally nonpathogenic in dogs and cats. Alaria is a potentially serious zoonotic risk to humans through the ingestion of raw or improperly cooked frogs containing mesocercaria.  

Zoonosis: consumption of inadequately cooked frogs’ legs (two intermediate hosts: frogs and freshwater snails !)


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