
Parasites in cats are a common problem that can cause a range of health issues, from mild discomfort to life-threatening diseases.
The most common types of parasites found in cats are fleas, ticks, worms, and mites. Fleas are tiny, flat insects that feed on a cat's blood and can cause intense itching and discomfort.
Cats can get fleas through contact with an infected animal or by walking in areas where fleas are present. Fleas can also lay eggs in a cat's bedding or on their fur, which can hatch into new fleas.
Some common signs of a flea infestation include excessive scratching, hair loss, and small, red bites on the skin.
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Types of Parasites
Giardia is a highly contagious intestinal parasite that can cause diarrhea and weight loss in cats. It's often spread in large groups of cats or kittens in unsanitary conditions.
Cats can become infected with giardia from drinking contaminated water or being around other cats that are infected.
Ticks
Ticks can be tricky to find on your cat, especially if they have thick fur.
If you live in a wooded area, you're likely familiar with looking for ticks on both yourself and your pets.
Removing a tick requires removing the entire body to prevent things like Lyme disease.
To prevent ticks in the future, give your cat preventative parasite medicine that deters ticks from biting cats.
Flukes
Flukes are a type of parasite that can infect cats, and they come in several types.
Intestinal flukes are one of the most common types of flukes that infect cats. These parasites are found in the intestines of cats and can be contracted through eating raw or improperly prepared salmon and similar fish.
The symptoms of intestinal flukes can be severe, causing enteritis, or inflammation of the intestines. In some cases, the infection can be compounded by a rickettsial infection carried by the flukes, known as "salmon poisoning disease".
Other types of flukes, such as liver flukes and pancreatic flukes, can also infect cats. Liver flukes are found in eastern Europe, Italy, and parts of Asia, and can be contracted through eating certain fish.
Liver flukes can cause long-term damage to the liver and pancreas, leading to thickening and scarring of the bile and pancreatic duct walls.
Here's a breakdown of some of the types of flukes that can infect cats:
It's worth noting that fluke infections are uncommon in the US, but can be serious if left untreated.
Round (Ascarids)
Round (Ascarids) are one of the most common parasites found in cats and dogs. They can grow up to three inches long and are often found in the small intestine of infected animals.
Kittens can get roundworms from their mother while still in the uterus or through nursing. This is because the parasites can be dormant for years and then cause a cat to become reinfected.
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Adult cats can become infected by eating infected stool or a mouse that has roundworms. This is why it's essential to practice good hygiene around your cat, especially if you have a garden or live in an area with rodents.
Roundworms can cause a range of symptoms in cats, including a dull coat, loss of condition, and a potbellied appearance. They can also cause pneumonia in kittens and diarrhea with mucus in infected cats.
Infections with roundworms are often not associated with any signs, but they can be diagnosed by microscopic detection of eggs in feces. This is why regular fecal exams are crucial for identifying and treating roundworm infections.
Treatment for roundworm infections in cats involves the use of certain medications, which your veterinarian can prescribe. It's essential to follow the treatment plan to ensure the infection is fully cleared.
Preventing roundworm infections is key, and this can be achieved through regular fecal exams, proper hygiene, and using preventative programs for heartworm infection.
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Giardia
Giardia is a highly contagious parasite that can cause diarrhea and weight loss in cats. It's often spread in large groups of cats or kittens in unsanitary conditions.
Cats can become infected with giardia from drinking contaminated water or being around other cats that are infected. This parasite can cause cysts both internally and externally on a cat which can continue to spread the disease.
If a cat is diagnosed with giardia, they need to be separated from other animals immediately. This is because giardia is a highly contagious parasite.
Symptoms of giardia infection in cats include chronic soft stools to profuse watery diarrhea, often with mucous mixed in. Weight loss, lethargy, dehydration, and anorexia may also occur.
Treatment for giardia can be difficult, as there is a high degree of recontamination of the patient. Bathing the animal during treatment is recommended to help prevent reinfection by your pet licking cysts off of its fur while grooming.
Physaloptera

Physaloptera, also known as stomach worms, are parasites that live in the stomachs of cats and dogs.
To diagnose Physaloptera, your veterinarian may perform an endoscopy, or your pet may vomit up a worm.
Eggs from Physaloptera are not easily detected on routine fecal exams, but submitting fresh stool samples (less than 24 hours old) can improve the chances of detection.
It's essential to keep these stool samples refrigerated, not frozen, to ensure accurate results.
Physaloptera are not infectious to humans, so you don't have to worry about getting infected from your pet.
If you suspect your pet has Physaloptera, it's crucial to consult with your veterinarian for the best treatment options, as there is no single dewormer that can control all intestinal parasites.
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Causes and Prevention
Cats can get worms through various means, including being passed on through feces, ingesting an infected host, and grooming themselves after coming into contact with fleas.
Fleas are a major culprit when it comes to worm infestations, as they can carry worms that can infect your cat. This is why a strict year-round flea prevention regimen is essential to reduce the risk of tapeworm infection.
To keep your cat safe, consider preventative deworming every 3 months if they're avid hunters or spend time both indoors and outdoors. This can help eliminate any intestinal worms before they become a problem.
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Can Get Parasites?

Cats can get parasites from other animals, including dogs. Yes, cats can contract worms from dogs, typically when a cat ingests feces from a dog that is infected with worms.
Cats can also get parasites from contaminated food or water. This is especially true if their food or water bowls are not cleaned regularly.
Some parasites can be transmitted through direct contact with an infected animal. For example, fleas and ticks can carry tapeworms and transmit them to cats when they bite.
Regular grooming and bathing can help reduce the risk of parasite transmission.
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Preventing Infestation
Preventing an infestation of worms in cats requires a multi-faceted approach.
Fleas carry worms, so sticking to a strict year-round flea prevention regimen can significantly reduce the risk of tapeworm infection.
If your cats are avid hunters, preventative deworming every 3 months is crucial to eliminate any intestinal worms before they become a large burden.
Keeping your cat's litter box fresh and clean on a daily basis is essential to prevent re-infestation.
Some worms can be harmful to humans, so it's vital to clean up cat feces immediately, wash your hands, and wear gloves whenever cleaning the litter box.
By following these simple steps, you can significantly reduce the risk of infestation and keep your cat, yourself, and your home safe.
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How to Care for Your

Caring for your cat is a big responsibility, and part of that is dealing with parasites. Diagnosing the correct parasite your cat is infected with is an important part of their treatment plan. Your veterinarian will provide specific instructions for how to collect a stool sample, which is typically required to check for internal parasites.
Many veterinarians recommend checking for parasites a few times after treatment has finished to ensure that the medication worked properly. This is to make sure your cat is completely parasite-free. It's a good idea to follow up with your vet to confirm.
Preventative treatments can be a lifesaver for cats. Many veterinarians provide preventative parasite medicines that combat fleas, ticks, and heartworms all in one. This can be especially helpful for kittens, who are more prone to parasites early on in life.
Parasites can cause mild to severe discomfort depending on the location and intensity of the parasite. Always report any unusual symptoms to your veterinarian to make sure your cat stays as healthy as possible. If you notice anything out of the ordinary, don't hesitate to reach out to your vet.
How to Get Worms
Cats can get worms from ingesting feces from infected animals, including dogs. This is a common way for cats to contract worms.
Fleas are another way cats can get worms. If your cat grooms itself and swallows fleas, it can ingest tapeworms that the fleas are carrying.
Cats with a history of hunting may be more likely to get worms from their prey. This includes birds, rodents, reptiles, and insects.
Preventing worm infestations requires regular deworming and flea prevention. This can be done every 3 months for cats that spend time outdoors or are avid hunters.
Cleaning up cat feces immediately and washing your hands is crucial to prevent the spread of worms to humans.
Symptoms and Diagnosis
Symptoms of parasites in cats can be quite distressing for both the cat and the owner. Cats can contract worms from contaminated feces, fleas, or rodents.
Visible signs of worms include whole worms, parts of worms, or worm eggs in your cat's stool or vomit. Worms or eggs can also sometimes migrate to a cat's anus, getting stuck in the fur.
A change in coat is another common symptom, with fur appearing dull, rumpled, or clumped due to lack of nutrients or dehydration. Pale or white gums are a sign of anemia, which can be caused by worms.
Vomiting, diarrhea, and dark, tarry stool are all potential signs of worms in your cat. Increased appetite despite weight loss is another symptom, as the worms deprive your cat of vital nutrients.
Here are some common symptoms of parasites in cats:
- Visible presence of worms in stool or vomit
- Change in coat
- Change in color of gums
- Vomiting
- Change in stool/bowel movements
- Increased appetite despite weight loss
Coccidia
Coccidia is a single-celled organism that infects the intestines of dogs and cats.
It can only be detected by a microscopic exam of your pet's feces.
Your pet becomes infected by ingesting contaminated dirt or feces, or by eating intermediate hosts like mice.
This parasite is especially common in young and stressed animals.
It causes bloody, watery diarrhea.
In severe cases, especially in young animals, coccidia can be fatal.
There are no products available to kill the organism, so treatment focuses on stopping its reproduction.
Treatment usually lasts several days to weeks.
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Signs and Symptoms of Infections

If you notice your cat vomiting more frequently than usual, it could be a sign of worms. Vomiting is a common occurrence in cats, but if it's happening more often, worms could be the culprit.
Visible worms, parts of worms, or worm eggs in your cat's stool or vomit are a clear sign of infestation. You may also see worms or eggs stuck in your cat's fur around the anus.
A dull, rumpled, or clumped coat can indicate that your cat is infested with a parasite. This is due to a lack of nutrients or dehydration caused by the worms.
Pale or white gums can be a sign of anemia in cats, which is often caused by worms depriving them of vital nutrients. Healthy gums should be nice and pink.
Dark, tarry stool can indicate the presence of blood, potentially from hookworms. Worms in the gut can also cause diarrhea.
If your cat is eating more frequently despite losing weight, it could be a sign that worms are depriving them of vital nutrients. Your cat needs to take in more food to try to maintain their body condition.
Diagnosing

Diagnosing worms in cats is a relatively straightforward process. Your veterinarian will ask you to bring in a stool sample, which will be placed in a solution that allows the parasite eggs to separate from the feces and float to the top.
The solution helps to isolate the eggs, making it easier to identify the type of worm infesting your cat. A drop of the sample is then placed on a slide and examined under a microscope to determine the exact type of worm.
A physical exam, along with blood work, may also be carried out to get a complete picture of your cat’s health. This is because the lifecycle of each parasite is different, and it's essential to know exactly the type of worm infesting your cat.
After treatment, your cat will likely need another fecal exam to ensure the worms have been wiped out. Most intestinal worms in cats are easily resolved with either a single dose of dewormer or a short course of deworming medication.
Are Painful?

Worms can be painful for cats, and in particular those with heavy parasite loads or related issues may become very unwell.
Gastrointestinal symptoms such as vomiting, diarrhea, and cramping can cause significant discomfort for cats.
Inflammation of the affected tissues can occur as certain worm larvae travel through a cat's internal organs.
Treatment and Consequences
Treating worms in cats requires deworming medication that kills both larvae and adult worms within the cat's intestines.
In many cases, dewormers are given in multiple doses to interrupt the life cycle of the intestinal parasite.
The second dose is usually used to kill any worms that might have hatched after the first dose was administered.
How to Treat
To treat worms in cats, deworming medication is the best option. This type of medication kills both the larvae and adult worms within your cat's intestines.
The medication may need to be given in multiple doses to interrupt the life cycle of the intestinal parasite. In many cases, a second dose is used to kill any worms that might have hatched after the first dose was administered.
Following your vet's instructions for dosage amounts and when to administer them is crucial.
Untreated Consequences
If worms go untreated in cats, serious health issues can arise. Depending on the type and severity of infection, untreated worm infestations can lead to malnutrition.
Cats can develop severe anemia if worms are not treated. This is a potentially life-threatening condition.
Intestinal obstructions can also occur if worms are left untreated. This can be a life-threatening complication.
It's crucial to treat worm infestations as soon as possible to prevent these serious health issues.
Frequently Asked Questions
What is the most common cat parasite?
Roundworms are the most common cat parasite, affecting up to 50% of cats at some point in their life. Learn more about how to identify and prevent roundworm infestations in your feline friends.
How do you get rid of intestinal parasites in cats?
To get rid of intestinal parasites in cats, use veterinary-approved preventives like spot-on treatments or oral medications as directed by your veterinarian. Regular use and a consistent schedule are key to effective parasite control.
Do I need to clean my house if my cat has worms?
Yes, it's essential to thoroughly clean your home, especially areas where your cat has been, to prevent the spread of worms and their eggs
How likely are you to get worms from your cat?
You're unlikely to get worms from your cat, but it's possible if you ingest worm eggs through contaminated food, water, or hands that haven't been washed properly. Learn more about how to prevent worm infections from your cat.
What diseases can humans get from cats?
Cats can shed diseases like Toxoplasma, Giardia, hookworms, and roundworms in their poop, which can be transmitted to humans if not handled properly. Wash your hands frequently and change the litterbox daily to minimize the risk of infection.
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