Toxoplasmosis in Cats: Complete Welfare Guide

Key Welfare Considerations

• Toxoplasma gondii is an intracellular protozoan parasite completing its sexual lifecycle only in felid hosts.
• Cats acquire infection through hunting and consuming infected prey, particularly rodents and birds.
• Most cats shed oocysts only once in their lifetime — typically for 1-3 weeks after primary infection.
• Sporulated oocysts in the environment are the primary zoonotic welfare concern — daily litter cleaning prevents sporulation.
• Clinical toxoplasmosis in cats is uncommon — most infections are subclinical with no welfare signs.
• Immunocompromised cats (FIV, FeLV, on corticosteroids) can develop severe systemic welfare disease.
• Respiratory, neurological, and ocular toxoplasmosis welfare impacts occur primarily in immunosuppressed cats.
• Clindamycin (25mg/kg/day divided twice daily for 4 weeks) is the standard welfare treatment for clinical cases.
• Pyrimethamine and trimethoprim-sulphonamide combinations offer alternative welfare treatment approaches.
• Serological testing detects antibodies but cannot determine current shedding — negative IgG indicates naive cats.
• High IgG titre with negative IgM suggests past immunity — lowest current zoonotic welfare risk.
• Keeping cats indoors prevents hunting — reduces both toxoplasmosis acquisition and wildlife welfare impacts.
• Commercial heat-treated cat food prevents dietary transmission — raw feeding increases welfare exposure risk.
• Welfare-positive messages should keep cats in homes while providing hygiene guidance for vulnerable owners.
• The welfare evidence supports coexistence of cats and vulnerable owners through appropriate hygiene measures.