Feline Tritrichomonas Foetus: Welfare and Management in Cats

Tritrichomonas foetus is a protozoal pathogen causing chronic large bowel diarrhoea in cats, particularly kittens in multi-cat households and catteries, with welfare implications from persistent gastrointestinal disease.

Key Facts

T. foetus is transmitted by faecal-oral route and is common in high-density cat populations
Clinical signs include chronic, malodorous, semi-formed faeces with mucus and sometimes blood
Many infections self-resolve in adult cats over 2 years but may persist for months in kittens
Diagnosis requires PCR testing of faeces as trophozoites are fragile and easily missed on microscopy
Ronidazole treatment is effective but must be dosed carefully due to neurological side effects

Welfare Considerations

Tritrichomonas foetus infection causes chronic large bowel discomfort through mucosal inflammation, producing persistent urgency, discomfort during defecation, and anal irritation in affected cats. Kittens in catteries with high infection prevalence may experience months of chronic gastrointestinal discomfort before spontaneous resolution. The impact on quality of life is significant — cats with chronic diarrhoea show reduced grooming, social engagement, and normal behavioural repertoire. Prompt diagnosis using PCR, treatment with ronidazole at correct doses, and environmental hygiene to prevent reinfection resolve welfare compromise in most cases.

What You Can Do

Request PCR faecal testing for T. foetus in kittens from multi-cat environments with chronic diarrhoea
Implement ronidazole treatment at correct doses with neurological monitoring during treatment
Maintain rigorous litter tray hygiene to prevent reinfection from environmental contamination
Retest cats at 4 weeks post-treatment to confirm parasitological cure
Screen all cats in multi-cat households and catteries when one individual is diagnosed