Can Your Cat Make You Sick? The Truth About Cats and E. coli


E. coli is a common bacteria found in the environment and intestines of animals, including humans and cats. Some strains of E. coli, such as E. coli O157:H7, can cause serious foodborne illnesses in humans. There are concerns about whether domestic cats can transmit these harmful strains of E. coli to humans.

In this article, we’ll look at the risks of cats spreading E. coli to humans. We’ll cover what E. coli is, how cats and humans can become infected, transmission routes between cats and humans, associated illness risks, prevention methods, symptoms, and treatment options.

Understanding how cats can spread E. coli to humans can help pet owners make informed decisions about reducing risks. While the threat is low in most cases, it’s wise to be aware of transmission routes and take reasonable precautions.

What is E. coli?

E. coli stands for Escherichia coli, which is a type of bacteria that normally lives in the intestines of humans and animals (WebMD). E. coli is a gram-negative, rod-shaped bacterium that is commonly found in the lower intestine of warm-blooded organisms (Cleveland Clinic).

Most strains of E. coli are harmless and can help keep the intestines healthy. However, some strains can cause intestinal illness, urinary tract infections, respiratory illness and other health problems (Healthdirect).

There are many different strains of E. coli. Although most strains are harmless, others can cause diarrhea, urinary tract infections, respiratory illness and pneumonia, and other illnesses (WebMD).

How do humans get E. coli?

Humans can get infected with E. coli in several ways:

Eating contaminated food or water: One of the most common ways E. coli spreads is through contaminated food or water. Foods like undercooked ground beef, unpasteurized milk and juice, raw fruits and vegetables, and contaminated water can contain E. coli. Consuming these can allow the bacteria to enter the digestive system and cause infection (Mayo Clinic).

Contact with feces: E. coli bacteria live in the intestines of humans and animals. Contact with feces from an infected human or animal and then touching your mouth can spread E. coli. This can happen when changing diapers, using the bathroom and not washing hands properly afterwards, or touching contaminated surfaces (WHO).

Direct contact with infected humans or animals: E. coli can spread through direct contact with an infected person or animal. For example, caring for someone with an E. coli infection without properly washing hands after can allow transmission (Cleveland Clinic).

Can cats have E. coli?

Yes, cats can be carriers of E. coli bacteria. E. coli is commonly found in the gastrointestinal tract of cats, just like in humans. However, most E. coli strains are harmless. Pathogenic strains like E. coli O157 can sometimes infect cats and cause illness 1.

Cats may acquire E. coli through ingesting contaminated food or water, contact with infected feces, or exposure in their environment. Young kittens and cats with weakened immune systems are most susceptible. Signs of E. coli infection in cats can include diarrhea, vomiting, lethargy, and fever 2.

While healthy adult cats harbor E. coli asymptomatically, cats exhibiting clinical illness from pathogenic strains can potentially transmit bacteria to humans through feces. Proper hygiene like washing hands after handling cat litter is important to reduce risk.

How can cats transmit E. coli?

Cats primarily transmit E. coli to humans through their feces. When a cat is infected with E. coli, the bacteria is shed in the cat’s feces. If humans come into contact with infected feces, such as when cleaning a litter box, they can accidentally ingest the bacteria and become infected (CDC, PetMD). The E. coli bacteria can enter the human body through the mouth and be swallowed.

Another way cats can transmit E. coli is through bites and scratches. If a cat has E. coli bacteria on its teeth or claws, a bite or scratch can result in bacteria entering the human’s bloodstream and causing infection (Drake Center). For this reason, it is important for cat owners to practice good hygiene and wash any wounds from cat bites or scratches immediately.

In summary, the primary routes cats transmit E. coli to humans are through their infected feces getting ingested, as well as bites and scratches that allow bacteria into the bloodstream.

What are the risks?

The risks of developing severe illness from E. coli infection are higher for certain groups of people. According to the CDC, children under 5 years old, adults over 65, and people with weakened immune systems are at highest risk for developing severe symptoms and complications from E. coli, such as hemolytic uremic syndrome, which is a type of kidney failure [1].

Young children, especially infants, are particularly vulnerable because their immune systems are still developing. Their smaller bodies also make them more prone to dehydration from fluid loss caused by E. coli [2]. Proper hygiene and preventing exposure are key to reducing their risk of infection.

Those with compromised or weakened immune systems, such as people with HIV/AIDS, cancer patients undergoing chemotherapy, transplant recipients taking immunosuppressant medications, and people with autoimmune disorders, also have a greater chance of developing severe complications from E. coli. Their bodies have a harder time fighting off infections.

How to prevent E. coli transmission

Proper hygiene and sanitation practices are key to preventing the spread of E. coli from cats to humans. Here are some tips:

Clean litter boxes frequently – Scoop litter boxes at least once a day and change the litter completely every 1-2 weeks. Thoroughly wash litter boxes with soap and hot water to remove any traces of feces or urine that could contain E. coli bacteria.

Wash hands properly – Always wash hands with soap and warm water after touching cats, cleaning up after cats, cleaning the litter box, or picking up cat feces. Wash for at least 20 seconds and dry hands completely. Hand sanitizer can be used for cleaning hands if soap and water are unavailable.

Keep cats away from food prep areas – Do not allow cats on kitchen countertops or anywhere human food is prepared. This prevents any E. coli bacteria from being transferred from their paws or fur.

Disinfect surfaces – Use a disinfectant designed to kill bacteria to regularly clean surfaces a cat may come into contact with, like floors, furniture and cat bowls. This eliminates any E. coli left behind.

Avoid contact with cat feces – Wear gloves when cleaning the litter box and sanitize the area afterwards. Never touch cat feces directly or let children play in areas a cat may defecate.

Monitor cat health – Routinely monitor cats for signs of illness and promptly take them to a vet if diarrhea or other symptoms arise. Sick cats shed more E. coli bacteria in feces.

Properly dispose of cat waste – Place soiled cat litter in securely tied plastic bags and discard with other waste rather than flushing down the toilet.

Signs of E. coli Infection

The most common signs and symptoms of E. coli infection include:

  • Diarrhea – E. coli often causes watery or bloody diarrhea that may range from mild to severe. According to the CDC, diarrhea from E. coli infection is often bloody. The Mayo Clinic states that E. coli diarrhea can lead to dehydration if severe.

  • Stomach cramps – Those infected with E. coli commonly experience severe stomach cramps and abdominal tenderness. The stomach cramps can range from mild discomfort to painful contractions as the intestines try to rid the body of the bacteria.

  • Vomiting – Some people with E. coli will develop nausea and vomiting along with the diarrhea. Vomiting may be more common in young children with E. coli infections.

Other possible symptoms include a mild fever, chills, loss of appetite, and fatigue. Symptoms of E. coli infection generally appear within 1 to 10 days after ingesting the bacteria, with 3 to 4 days being typical (Mayo Clinic).

Treating E. coli infections

Treatment for E. coli infections focuses first on hydration and rest. Drinking fluids like water, broths, or electrolyte-rich sports drinks can prevent dehydration caused by diarrhea or vomiting. Rest allows the body to devote energy to fighting off the infection.

In severe cases, antibiotics may be used. According to the Mayo Clinic, antibiotics can treat secondary infections and complications, but cannot cure the E. coli infection itself ( Antibiotics that may be prescribed include trimethoprim/sulfamethoxazole, amoxicillin, cephalosporins, or fluoroquinolones. However, antibiotics can sometimes make the infection worse by causing the bacteria to release toxins.

It’s important to finish the entire antibiotic prescription, even after symptoms improve, to fully eliminate the bacteria from the body. Close monitoring by a medical professional can help determine if antibiotics are needed and prevent complications.


In summary, while E. coli is a common bacterium that can be found in the intestines of animals like cats, transmission from cats to humans is rare. E. coli is mainly spread through contaminated food and water. However, cats can sometimes carry strains of E. coli that are harmful to humans. Proper handling of cat feces, thorough handwashing, and avoiding contact with cat saliva can prevent potential E. coli transmission from cats. While most E. coli infections cause diarrhea, some strains can lead to more serious illness. Seeking prompt medical care is important for severe symptoms. Overall, the risk of contracting E. coli from cats is low with proper hygiene and care.

The key takeaways are:

  • E. coli is a type of bacteria that lives in the intestines of animals and humans.
  • Humans most often get infected with E. coli through contaminated food/water.
  • Cats can carry E. coli strains that may be harmful to humans.
  • Transmission risk is low with good hygiene around cats.
  • Symptoms of E. coli infection include diarrhea, abdominal cramps, nausea.
  • See a doctor immediately for signs of infection like bloody stool.

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