고양이 에키노코쿠스 자주 묻는 질문 Q&A — 보호자가 꼭 알아야 할 핵심

Feline Echinococcosis FAQ — Key Information Every Pet Owner Must Know

Infection/ParasitesQ&AMeongsiljang Veterinary Advisory Board

Feline echinococcosis is a parasitic infection that can also pose a risk to humans. We’ve compiled the essential information pet owners need to know, including symptoms, transmission routes, and prevention methods.

What is feline echinococcosis?

Echinococcus parasites and eggs residing in a cat's intestines

Feline echinococcosis is a parasitic infection that can also cause serious health problems in humans. It is most commonly found in cats that prey on small animals such as mice or rabbits. The adult parasites live in the intestines and spread through their eggs. When these eggs are shed in the feces of an infected cat, they can persist in soil or on plants for extended periods, potentially infecting other animals or people. Children are particularly at risk if they come into contact with contaminated soil or consume unwashed fruits.

How is it transmitted?

Feline echinococcosis is primarily found in cats that prey on small animals such as mice or rabbits. The adult parasites reside in the intestines, and transmission occurs via eggs. When eggs are present in the feces of an infected cat, they can contaminate soil or plants. Humans or other animals may become infected by touching contaminated soil or ingesting contaminated food. Children are at particularly high risk if they play in dirt at playgrounds or eat fruit without washing their hands first.

Visualizing the infection route: a child putting soil-contaminated hands into their mouth

What are the main symptoms in infected cats?

Feline echinococcosis is primarily transmitted through cats that prey on small animals like mice and rabbits. The parasite's eggs are shed in the cat's feces and can persist in soil or on plants for extended periods. Humans may ingest these eggs by coming into contact with contaminated soil or plants, or by eating unwashed fruits. Once ingested, the eggs hatch in the digestive tract and migrate to other organs, such as the liver or lungs, potentially causing multi-nodular lesions. Children are at particular risk if they play in dirt at playgrounds or eat without washing their hands.

A cat with white parasitic segments attached near its anus.

Signs requiring immediate veterinary attention

In the early stages, echinococcosis in cats is often asymptomatic. Most commonly, owners notice small, white segments in their cat’s feces or parasites clinging to the area around the anus, even though the cat otherwise appears healthy and behaves normally. In some cases, symptoms such as abdominal swelling, weight loss, or decreased appetite may develop, but these are easily mistaken for other conditions. Therefore, if your cat has a habit of hunting and eating wild animals, regular parasite screening is essential. Even in the absence of symptoms, there is still a risk of infection, so vigilance is important.

How to confirm infection?

If you notice small white segments (proglottids) in your cat’s feces or parasite fragments around the anus, consult your veterinarian immediately. However, since most infected cats show no obvious symptoms, the most reliable way to confirm an infection is through a fecal exam to check for parasite eggs. If your cat suddenly loses its appetite, experiences rapid weight loss, or develops a distended abdomen, it’s advisable to have them checked for other potential conditions. One important point to note is that severe diseases involving cystic lesions in the liver or lungs typically occur in intermediate hosts like humans or rodents, whereas in cats—the definitive host—adult parasites usually remain in the intestines. Still, cats that hunt and eat outdoor animals are at high risk of reinfection, so early detection and regular check-ups significantly improve treatment and management outcomes.

A veterinarian examining a cat's stool under a microscope.

Comparison of response methods by infection risk level

Item	Risk Level	Likelihood of Infection	How to Respond
Low	Indoor life, no outings	Low	Regular parasite testing (once every 6 months)
Medium	Regular outdoor activity	Medium	Testing every 3 months + hand washing after outings
High	Has a habit of hunting mice/rabbits	High	Testing every month + taking parasite prevention medication

The risk level varies depending on the cat's frequency of going outdoors and hunting habits.

What are the treatment methods?

Intestinal adult worm infections in cats, the definitive hosts, are typically managed with medication. Administering prescribed dewormers such as praziquantel can eliminate adult parasites residing in the intestines. However, if the source of infection persists, such as through hunting behavior, reinfection may recur; therefore, regular deworming according to a schedule set by your veterinarian is essential. Meanwhile, severe lesions involving cyst formation in organs like the liver or lungs primarily affect intermediate hosts such as humans. In these cases, surgical removal of the cysts or long-term drug therapy with praziquantel or albendazole may be required. During treatment, take care to prevent the spread of parasite eggs through the cat’s feces, and after treatment, regular examinations are necessary to check for reinfection. Above all, prevention is far more important than treatment.

A veterinarian administering deworming medication to a cat

Precautions for pet owners

After your cat has expelled parasites, immediately place the feces in a sealed bag and dispose of it in the trash. Always wash your hands thoroughly with soap. It is especially important to teach children to wash their hands after playing with cats. When your cat returns from outside, wipe its paws and check its body for any attached parasites. If you suspect an infection, we recommend visiting the vet immediately.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

If my cat ingests parasites, can I get infected too?

Yes, if a cat ingests Echinococcus and excretes the eggs, which then contaminate soil or plants, people can become infected by eating unwashed fruits or handling contaminated soil without washing their hands.

How often should parasite testing be done?

For indoor cats, consider testing every six months; for cats that go outdoors frequently, every three months; and for cats with hunting habits, every month. However, it’s best to determine the exact schedule in consultation with your veterinarian.

When should I give my pet parasite prevention medication?

Parasite preventatives should be administered regularly under your veterinarian’s guidance. Since the dosing schedule and amount can vary depending on the product and your cat’s individual risk factors, it’s important to consult with your vet before starting treatment.

What happens if parasites migrate to the liver or lungs?

When larvae migrate to the liver or lungs and form cystic lesions, this typically occurs in intermediate hosts such as humans or rodents. In these cases, symptoms may include abdominal swelling (ascites), jaundice, weight loss, and difficulty breathing, often requiring surgical removal of the cysts or long-term medication.

My cat ate a parasite, but there are no symptoms now. Is it okay?

Even if there are no symptoms, infection is still possible. Parasites often show almost no signs in the early stages, so regular testing is essential. Early detection significantly improves treatment success rates.