Feline roundworm infection is most often caused by Toxocara cati, one of the most common intestinal parasites of cats worldwide. Kittens are frequently infected, including via the queen's milk, and can carry heavy burdens. Larvae migrate through the body, and adult worms live in the small intestine. The parasite has zoonotic potential, capable of causing larva migrans in people.
Toxocara cati is a large intestinal roundworm of cats. Infections are very common, particularly in kittens, and contribute to environmental egg contamination.
Cats acquire infection by ingesting eggs from the environment, eating infected prey such as rodents, or, for kittens, through the queen's milk. Larvae migrate through tissues before adults mature in the gut.
Many adult cats show no signs. Kittens with heavy burdens may have a pot-bellied appearance, poor growth, vomiting (sometimes with visible worms), diarrhoea, and a dull coat.
Faecal flotation detects characteristic eggs; adult worms are sometimes seen in vomit or faeces.
Routine deworming with effective anthelmintics clears infection; kittens need repeated treatment starting at a few weeks of age, and nursing queens are treated alongside.
Regular deworming, prompt faeces removal, rodent control, and limiting hunting reduce burden. Hand washing and covering sandpits protect people from accidental egg ingestion.
This content is for educational purposes and is not a substitute for professional veterinary advice. If you are worried about your pet, contact your veterinarian.
