Introduction & Key Points

Roundworms are the most common intestinal parasites in cats—primarily Toxocara cati and Toxascaris leonina. In this 2025 guide, learn everything you need to know to safeguard your cat (and your family) from infection and reinfection.

• 🧬 **Common species:** T. cati most frequent; T. leonina also occurs :contentReference[oaicite:3]{index=3}.
• 📈 Up to 25 % of cats carry roundworms—higher in kittens :contentReference[oaicite:4]{index=4}.
• ❗ Symptoms vary—from asymptomatic adults to sick, pot‑bellied kittens with cough, vomiting, diarrhoea, weight loss :contentReference[oaicite:5]{index=5}.
• 🧫 Diagnosis by stool flotation or seeing worms in vomit/stool.
• 💊 Treatment involves repeat anthelmintics like fenbendazole, pyrantel, moxidectin, imidacloprid/moxidectin :contentReference[oaicite:6]{index=6}.
• 🧼 Prevention includes regular parasite control, litter hygiene, and indoor living.
• 🧑‍🤝‍🧑 Zoonotic risk requires household hygiene and safe handling of feces :contentReference[oaicite:7]{index=7}.

1. Lifecycle & Transmission

The life cycle varies by species:

• T. cati: larvae ingested via eggs, migrates through liver, lungs, and intestines. Kittens can get infected via mother’s milk or environment :contentReference[oaicite:8]{index=8}.
• T. leonina: transmitted through eggs or infected prey; larvae usually remain in intestines :contentReference[oaicite:9]{index=9}.
• Both spread via feces; eggs need 2–4 weeks in soil to become infectious :contentReference[oaicite:10]{index=10}.

2. Who Is at Risk?

• Kittens—especially from infected queens due to milk transmission :contentReference[oaicite:11]{index=11}.
• Outdoor/hunting cats ingest eggs from soil or prey like rodents :contentReference[oaicite:12]{index=12}.
• Indoor adults can still be infected due to contaminated soil or prey brought indoors.

3. Signs to Watch For

• 🧸 Pot-bellied appearance, especially in kittens
• 📉 Poor growth, weight loss, dull coat
• 🤢 Vomiting or diarrhoea, sometimes mucus or visible worms
• 😮 Cough due to lung migration; pneumonia in heavy infections
• 🦠 Occasionally intestinal blockage in severe cases :contentReference[oaicite:13]{index=13}.
• 🔎 Many adult cats show no symptoms :contentReference[oaicite:14]{index=14}.

4. Diagnosis

1. History & observation: look for worms in vomit/stool
2. Stool flotation: egg detection under microscope—gold standard :contentReference[oaicite:15]{index=15}.
3. Fecal antigen or PCR: more sensitive but not commonly used.

5. Treatment

Anthelmintics

• Fenbendazole: effective against larvae and adults :contentReference[oaicite:16]{index=16}.
• Pyrantel, milbemycin, moxidectin: common broad-spectrum options :contentReference[oaicite:17]{index=17}.
• Repeat doses every 2–3 weeks to eliminate maturing larvae :contentReference[oaicite:18]{index=18}.

Supportive Care

• Fluid therapy and nutrition in malnourished or dehydrated cats
• Monitor kittens for anemia and secondary infections

6. Prognosis & Follow-Up

• 👍 Most cats recover fully with treatment and supportive care
• ⚠️ Severe infestations may lead to stunted growth or complications but often improve :contentReference[oaicite:19]{index=19}.
• 🔄 Retreatment recommended after 2–4 weeks; follow-up fecal test confirms clearance.

7. Prevention Strategies

• 📅 Deworm kittens starting at 2–3 weeks, repeat every 2 weeks until 2 weeks post-weaning :contentReference[oaicite:20]{index=20}.
• 💊 Routine parasite control year-round, especially in outdoor/hunting cats :contentReference[oaicite:21]{index=21}.
• 🏠 Keep cats indoors or limit unsupervised outdoor access.
• 🧽 Clean litter boxes daily, dispose of feces promptly.
• 🧼 Wash hands after pet contact; cover sandboxes, discourage kids from putting hands in soil.

8. Zoonotic Risks & Human Safety

Roundworm eggs spread disease in humans—especially children—causing visceral or ocular larva migrans. Eggs survive for months to years in soil :contentReference[oaicite:22]{index=22}.

• Practice hygiene: wash hands after handling cats or cleaning litter.
• Prevent children from playing in areas with cat feces.
• Deworm household cats to reduce environmental contamination.

9. FAQs

Can I see worms in my cat?

Yes—adult roundworms may appear in vomit or stool; often look like spaghetti strands :contentReference[oaicite:23]{index=23}.

Can indoor cats get roundworms?

Yes—especially if they ingest contaminated soil or rodents brought indoors.

How often should adult cats be dewormed?

At least quarterly, or monthly with broad-spectrum parasite control, following vet guidance :contentReference[oaicite:24]{index=24}.

Are roundworms dangerous to people?

Potentially—especially to children. Good hygiene helps protect your family :contentReference[oaicite:25]{index=25}.

10. Role of Ask A Vet

• 🐾 Use the app to share photos of worms or stool samples.
• 📅 Set reminders for deworming treatments and follow-up fecal testing.
• 📞 Ask questions about symptoms, safe medications, and home care tips anytime.

Conclusion

Roundworms are common but preventable and treatable parasites. Thanks to modern deworming protocols, hygiene practices, and early detection, most cats live healthy, worm-free lives. Protect your pet and family with routine parasite control and timely vet guidance.

Need personalized advice or treatment reminders? Ask A Vet is here for photo reviews, deworming schedules, and 24/7 support—download our app today! 🐾📲