Cat Toxoplasmosis: Welfare and Public Health

Toxoplasmosis is a parasitic infection involving cats as definitive hosts with implications for cat welfare management and human health.

Key Facts

Toxoplasma gondii is a protozoan parasite for which cats are the definitive host — oocysts shed in cat faeces contaminate soil and water
Healthy adult humans and cats rarely show clinical signs from toxoplasmosis, but immunocompromised individuals and foetuses face serious risk
Cats most commonly acquire infection from hunting and eating infected prey animals or raw meat
Indoor cats fed commercial food without raw meat have very low toxoplasmosis prevalence
Pregnant women and immunocompromised individuals should not handle used cat litter, but do not need to remove their cat from the household

Welfare Considerations

Toxoplasmosis is often cited as a reason to remove cats from households with pregnant women, causing unnecessary cat relinquishment and the welfare harm this entails. The actual risk from well-managed indoor cats is very low, and simple precautions — gloves for litter changing, daily litter cleaning — are sufficient. Misinformation about toxoplasmosis causes welfare harm to cats through unnecessary relinquishment and household stress.

What You Can Do

Keep cats indoors and feed commercial food rather than raw meat to minimise toxoplasmosis risk
Clean litter trays daily — oocysts are only infectious after 1-5 days, so daily cleaning removes them before they sporulate
Wear gloves for litter tray management and wash hands thoroughly — pregnant women should have someone else change the litter
Discuss actual risk assessment with your doctor or vet rather than making cat management decisions based on online misinformation