Cat Parasites Transmissible to Humans

Cats are wonderful companions, and while they can carry a few parasites that may infect people, the risk is generally low with good hygiene and regular veterinary care. Pregnant women, young children, older adults, and people with weakened immune systems should take extra precautions.

Common Parasites

1. Toxoplasmosis (Toxoplasma gondii)

Perhaps the most talked-about cat-related parasite, toxoplasmosis is caused by a microscopic parasite that cats can shed in their faeces after becoming infected — usually from eating infected prey or raw meat.

How it spreads to humans:

• Accidentally ingesting parasite eggs (oocysts) from contaminated litter, soil, or unwashed hands after cleaning a litter box
• Eating undercooked meat or unwashed produce (in fact, this is a far more common source of human infection than cats)

Prevention:

• Scoop the litter box daily — the parasite needs 1–5 days outside the cat to become infectious, so daily cleaning greatly reduces risk
• Pregnant women should ideally avoid litter box duty; if unavoidable, wear gloves and wash hands thoroughly afterward
• Wear gloves when gardening, since outdoor cats may use soil as a litter box
• Keep cats indoors and feed them commercial cat food rather than raw or undercooked meat

2. Toxocariasis (Roundworms)

Roundworms (Toxocara cati) are extremely common in kittens and outdoor cats. Eggs shed in faeces can survive in soil for months or years.

How it spreads to humans:

• Ingesting eggs from contaminated soil or surfaces, often via hand-to-mouth contact — this is why young children playing in sandboxes or gardens are at higher risk

Prevention:

• Deworm kittens and cats on a schedule recommended by your veterinarian
• Dispose of faeces promptly and wash hands after handling litter or soil
• Cover sandboxes when not in use
• Teach children to wash hands after outdoor play and before eating

3. Hookworms

Less common in cats than roundworms but still notable, hookworm larvae live in soil contaminated with infected faeces.

How it spreads to humans:

• Larvae can penetrate bare skin, typically the feet, causing a condition called cutaneous larva migrans — an itchy, winding rash

4. Fleas and Flea Tapeworm

Fleas aren’t just an itchy nuisance for cats — they’re a genuine transmission route for other parasites.

How it spreads to humans:

• Flea bites cause itchy welts in people
• Rarely, if a person (usually a small child) accidentally swallows an infected flea, they can contract the flea tapeworm (Dipylidium caninum)

5. Ringworm (Microsporum canis)

Despite the name, ringworm isn’t a worm at all — it’s a fungal infection, but it’s included here because it’s one of the most common conditions passed directly from cats to people through skin contact.

How it spreads to humans:

• Direct contact with an infected cat’s skin or fur, or contact with contaminated bedding, brushes, or furniture
• Appears as a circular, scaly, sometimes itchy patch on human skin

6. Giardia

Giardia is a microscopic intestinal parasite that can infect cats, dogs, and humans alike.

How it spreads to humans:

• Ingesting cysts shed in an infected cat’s faeces, usually through poor hand hygiene
• Causes gastrointestinal symptoms such as diarrhoea and cramping

7. Sarcoptic and Other Mites

Some mange mites that affect cats (notably Sarcoptes scabiei var. canis, more commonly linked to dogs) can cause a temporary, itchy skin reaction in humans, though they typically can’t complete their life cycle on human skin and resolve once the underlying pet infestation is treated.

Across every parasite on this list, a few core habits dramatically reduce risk:

• Scoop litter boxes daily and wash hands afterward
• Schedule regular veterinary check-ups and follow a deworming and flea/tick prevention plan suited to your cat’s lifestyle
• Wash your hands after handling cats, cleaning litter boxes, gardening, or touching outdoor soil
• Keep cats on a commercial diet rather than raw or undercooked meat
• Supervise young children around pets and reinforce hand-washing before meals
• Watch for skin, coat, or digestive changes in your cat and see a vet promptly if something seems off
• Take extra precautions during pregnancy, particularly around litter box duty

When to See a Doctor

If you develop an unexplained skin rash, persistent gastrointestinal symptoms, or flu-like illness and have regular contact with cats, mention this to your doctor. Zoonotic infections are often easy to diagnose and treat once identified.

This article is intended for general educational purposes and is not a substitute for professional veterinary or medical advice. If you have specific health concerns related to parasite exposure, consult your doctor or veterinarian.