This page quotes a published document. Everything below in quotation marks is copied word for word from https://capcvet.org/guidelines/ollulanus-tricuspis/, published by CAPC and retrieved on 2026-09-16. The quotations are excerpts; the document itself is linked and is the authority. Nothing has been reworded.
This page quotes the Companion Animal Parasite Council guideline for Ollulanus tricuspis, section by section: the opening sentences of 8 sections, copied without change and linked to the guideline, which was retrieved on 2026-09-16. The guideline itself is the authority and carries the full text.
The guideline
Companion Animal Parasite Council, Ollulanus tricuspis, at https://capcvet.org/guidelines/ollulanus-tricuspis/. Retrieved 2026-09-16. Each heading below is the guideline’s own, and the quotation under it is how that section begins. The full section, and the species tabs where the guideline gives them, are on the linked page.
Synopsis
CAPC Recommends Test cats that chronically vomit, often right after a meal, and not the typical hairball. This parasite has a direct lifecycle, so keep infected cats away from other cats in the home until the infected animal is clear of worms.
Species
Feline Ollulanus tricuspis (stomach worm of cats) *Photos courtesy of Dr.
Disease
O. tricuspis generally causes chronic vomiting, increased gastric mucous production, weight loss, and anorexia in cats. These worms are generally believed to be of low pathogenic potential to cats, but they have caused severe chronic gastritis and carcinogenesis in a few rare cases.
Prevalence
O. tricuspis has been observed worldwide including Canada, the United States, Argentina, Chile, Egypt, Australia, Japan, and throughout Europe and the Middle East. These worms most commonly infect domestic cats but have been observed to affect dogs (rarely), tigers, red fox, lions, cheetahs, and pigs.
Diagnosis
Diagnosis is only rarely made by direct fecal smears or fecal flotation methods because the adults and larvae of O. tricuspis that enter the intestine are usually dead, killed, destroyed, or digested before they are passed in the feces. A more reliable diagnosis is made with either induction of vomiting and gastric lavage.
Treatment
Cats have been treated with tetramisole administered at 5mg/kg body weight and has proved efficacious, without side effects. Additionally, the use of fenbendazole (50mg/kg daily for 5 days) and oxfendzole (10mg/kg daily for 5 days) has also been shown effective in treating cats with O. tricuspis .
Control and Prevention
Catteries and multi-cat households should be monitored for signs of increased vomiting in cats. If this occurs, the vomitus should be checked for the presence of O. tricuspis .
Public Health Considerations
There has been no report of human infections with O. tricuspis .
Continue reading public health considerations on capcvet.org
Sources
- capc-ollulanus-tricuspisCAPC · retrieved 2026-09-16
“CAPC Recommends Test cats that chronically vomit, often right after a meal, and not the typical hairball. This parasite has a direct lifecycle, so keep” (Synopsis)
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From Glarda
The note drafted from the consult, with the reference you just read sitting beside it in the shape your record already expects.