Atlas of livestock parasites
digitized collection of microscopical preparations

Atlas of Parasites Contents Information sources Glossary Administration

Ollulanus tricuspis



Untitled document

Nematode (order Strongylida) 

Distribution: Europe, North America, parts of South America, Australia.    

Host: Adult worms are found in the stomach of cats and other felids. 

Life Cycle: Ollulanus tricuspis is a small worm, ≤1 mm long, that infects several animal species, typically cats and other felids. Adult female worms are viviparous, in the stomach produce third-stage larvae that primarily leave the host in vomitus. Infection of cats occurs through ingestion of these larvae in vomitus.  

Diagnosis: Infection is diagnosed by identifcation of larvae or the small adults in vomitus, using the Baermann test. Rarely, stages of the parasite may be seen in feces, but they are usually digested before reaching the environment.       

Size: 500 µm Third-stage larvae                

Size: Adults 700–1000 µm     

Clinical features: Occasionally induces a mild erosive or catarrhal gastritis. Infection can cause chronic gastritis and vomiting in cats a few hours after eating. Colony and feral cats are most often infected.

Treatment: Therapeutic efficacy in cats has been demonstrated with fenbendazole (20–50 mg/kg, PO, sid for 3 days) and levamisole (5 mg/kg, SC, once), although these are not approved treatments.


No picture to show.

<<< Back