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Ollulanus sp in Small Animals

By

Andrew S. Peregrine

, BVMS, PhD, DVM, DEVPC, DACVM-Parasitology, Department of Pathobiology, Ontario Veterinary College, University of Guelph

Medically Reviewed Oct 2022
Topic Resources

Ollulanus tricuspis is a small worm, ≤1 mm long, that infects several animal species, typically cats and other felids, in countries around the world. Infections have recently been demonstrated in dogs in Japan. Parasitism occasionally induces a mild erosive or catarrhal gastritis. Vomiting minutes to a few hours after eating is a common sign. The female worms are viviparous, so massive infections can build up endogenously. Transmission is via vomitus.

Diagnosis is by microscopic demonstration of larvae (~500 mcm) or adult worms in vomitus or stomach contents. The use of a Baermann apparatus enables the separation of the worms from ingesta, after which they are easier to observe. Parasites are rarely present in feces, because they are usually digested before being passed. Therapeutic efficacy in cats has been demonstrated with fenbendazole (20–50 mg/kg/day, PO, for 3 days) or tetramisole (5 mg/kg, PO, once), although these are not approved treatments.

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