Coccidia in Cats: Symptoms, Treatment & Prevention

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Coccidia in kittens and cats inhabit the intestinal tract. There are several species of these tiny parasites that are found in cats and other mammals, and some species are contagious to humans. The good news is that healthy adult cats rarely get sick with coccidia, and most cats can beat coccidia infections on their own without treatment. Read on to learn more about coccidia in cats as well as signs that your cat might have these parasites.

What Is Coccidia in Cats?

Coccidia are parasites that live in the gastrointestinal tract of cats and other mammals. There are several species of coccidia parasites, and cats can harbor a few different types. Common types include Isospora felis and Isospora rivolta, intestinal parasites that only infect cats, and Cryptosporidium parvum and Toxoplasma gondii, two coccidia species which are both known to be zoonotic, or contagious to humans.

No matter the species of coccidia, they're all spread the same way: accidental ingestion of sporulated oocysts, the infectious life stage of coccidia parasites. Oocysts lurk in feces from cats infected with the parasite, or food or water contaminated with feces. Toxoplasma can also be spread by consuming raw meat infected with parasitic cysts; therefore, cats that hunt or eat raw meat are at higher risk for developing coccidia.

Signs of Coccidia in Cats

Signs of a coccidia infection vary based on the species of coccidia as well as the age and health of the cat. Coccidia in kittens usually causes more clinical signs than coccidia in healthy adult cats because kittens typically have a weaker immune system relative to adult cats. On the other hand, there may be no signs in adult cats — the cat may look and act completely healthy and be able to overcome the infection without treatment. Cats with other underlying health issues are at higher risk for developing coccidia.

Signs of coccidia in kittens include watery or mucusy diarrhea that is sometimes streaked with blood. A severe infection of coccidia in kittens can cause weakness. Signs of a possible infection with Toxoplasma may include no signs at all, or the cat may display signs such as:

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  • Excessive tiredness or sleeping
  • Weight loss
  • Fever
  • Excessive eye discharge or squinting
  • Difficulty breathing
  • Diarrhea
  • Vomiting
  • Loss of balance
  • Seizures
  • Weakness

Another factor to consider is that pregnant cats infected with Toxoplasma may deliver stillborn kittens. However, male cats seem to be at a higher risk for Toxoplasma than female cats.

Diagnosing Coccidia in Cats

If you suspect your cat is suffering from a coccidia infection, make an appointment to have your cat seen by your local veterinarian. When you take your cat to see the vet, try to bring a fresh sample of feces with you. Typically, coccidia can be diagnosed by a combination of history from you, a physical exam of your cat and a microscopic fecal examination.

Because many cats can be infected without the appearance of clinical signs, it's important to get your cat's feces tested at least yearly to make sure your cat isn't unknowingly harboring and spreading the parasite. However, the good news for toxoplasmosis is that cats only shed this parasite for around 7 days after the first time they're exposed. So although repeat exposure may cause your cat to become sick, it would be unlikely that they would be at risk of exposing other pets or people in your house to the parasite.

If your cat is visibly sick or the vet suspects a Toxoplasma infection or other disease, then the vet may order additional tests to check how your cat's internal organs are functioning and rule out other diseases. They may also do blood tests that look for antibodies against the toxoplasma parasite to help determine if they've ever been exposed or are dealing with an active infection.

Treatment Options

Fortunately, most coccidial infections resolve on their own. However, if need be, coccidia can be easily treated. For infections due to Isospora, sulfadimethoxine is often prescribed, and affected cats are treated until their fecal tests come back negative for parasites. Cryptosporidium in cats can be treated with antibiotics such as tylosin or paromomycin. Another form of medication, ponazuril, may also be prescribed. In any case, your vet will know the best medicine to use for your cat.

Toxoplasma infections are more likely to require treatment, especially if your cat is acting sick, and is often treated by prescribing a two-week course of an antibiotic called clindamycin. Clindamycin can cause negative side effects in some cats, including loss of appetite, vomiting and diarrhea. If you notice any side effects, call your vet. Otherwise, finish all medications as prescribed, even if you notice your cat is feeling better.

If your cat is extremely ill or dehydrated, then your vet may recommend rehydrating your cat with subcutaneous or intravenous fluids.

Prevention Options

Coccidial parasites are everywhere within the environment. Fortunately, most healthy adult cats can fight off coccidia with their immune system. Keeping cats indoors and having their feces tested yearly for any parasites is a good way to minimize you and your cat's exposure to internal parasites.

Pregnant women are at most risk for Toxoplasma as the parasite can cause potentially fatal birth defects in human babies. If you're pregnant and have cats, ask someone else to clean the litter box, do not handle any cat feces and wash your hands after petting or playing with your cats. You can also talk to your doctor about being tested for Toxoplasma antibodies or talk to your vet about having your cat tested for antibodies to assess your risk.

Remember, the most common form of coccidia in cats, Isospora felis, is not contagious to people or dogs, and most adult cats eliminate the infection without any treatment. If you have a kitten, your cat is acting sick, or you're worried in any way, never hesitate to ask your local vet for help.

Contributor Bio

Dr. Sarah Wooten

Dr. Sarah Wooten

A 2002 graduate of UC Davis School of Veterinary Medicine, Dr. Sarah Wooten is a well-known international speaker in the veterinary and animal health care spaces. She has 10 years experience in public speaking and media work, and writes for a large number of online and print animal health publications. Dr. Wooten has spoken in the veterinary education space for 5 years, and speaks on leadership, client communication, and personal development. Dr. Wooten is also a certified veterinary journalist, a member of the AVMA, and has 16 years experience in small animal veterinary practice. In addition to being a speaker, author, veterinarian, and co-creator of the wildly popular card game 'Vets Against Insanity', she co-owns Elevated Eateries Restaurant group in Greeley with her husband of 21 years, and together they are raising 3 slightly feral mini-humans. When it is time to play, she can be found skiing in Colorado, diving with sharks in the Caribbean, or training kenpo karate in her local dojo. Go big...or go home. To learn more, visit