Bacterial Infections In Cats: Causes, Symptoms, & Treatment

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Bacteria are everywhere!

Most bacteria are harmless to both us and our cats, and many are actually beneficial. However, some types of bacteria (called pathogenic bacteria) can make our cats unwell if their immune systems are unable to fight them off.

Bacterial infections are a common cause of illness in cats, but luckily most bacterial infections can be treated.

What Is A Bacterial Infection?

Bacteria, or germs, are microscopic organisms that are the size of just one cell. Bacteria play a vital role both inside our bodies, and in the world around us.

Like us, our cats are exposed to thousands of bacteria every day, and most of these don’t make them sick. However, if your cat encounters a harmful or pathogenic bacteria, they can multiply within your cat’s body resulting in a bacterial infection.

What Are The Symptoms Of Bacterial Infections In Cats?

Bacterial infections can affect any part of your cat’s body, and the symptoms they cause depend on the type of bacteria and the area of your cat’s body that is affected.

Common clinical signs of a bacterial infection include:

Other signs tend to be more specific to the area of the body that is affected. Common bacterial infections in cats include:

Respiratory Tract Infections

Respiratory tract infections in cats often cause sneezing, runny eyes (conjunctivitis) and nose, changes in breathing, or a cough.

Gastrointestinal Infections

Sites of lymphoma in cats

Infections of the gastrointestinal system in cats often cause vomiting and diarrhea, as well as reduced appetite and weight loss.

Ear And Skin Infections

Skin disease and ear infections are another common bacterial infection seen in cats. Signs include redness of the skin, scaly skin, a bad smell, itching, hair loss, pus, and lesions such as scabs, spots, abscesses, or wounds.

Dental Infections

Cats commonly suffer from infections in their mouths, particularly if they have had untreated dental disease for some time. Signs of a tooth infection include going off their food, pain when eating or opening their mouths, bad breath, or pus coming out of the mouth.

Urinary Tract Infections

Lower urinary tract infections such as bladder infections (also called cystitis) in cats may cause frequent urination in unusual places, blood in the urine, and pain when urinating, which may cause your cat to cry out.

Also Read: What Can You Give A Cat For Pain? 6 Vet-Recommended Options

It is important to note however that in cats under the age of 10, most cases of cystitis are not caused by infection and therefore do not need treatment with antibiotics.

Uncommon Bacterial Infections In Cats

Why is my cat sneezing

Cat sneezing occurs for a wide variety of reasons, including viruses, infection, irritation, and more. But how do you know why your cat is sneezing?

All your cat’s organs can be affected by bacterial infections. We have listed the symptoms of the most common types of bacterial infections in cats above. However, your cat could also suffer from bacterial infections of the blood, immune system, bones and joints, and other organs such as the heart and brain. These infections can be very serious but are uncommon.

What Are The Causes Of Bacterial Infections In Cats?

Ear infections caused by bacteria require treatment with antibiotics.

Bacterial infections can occur in healthy cats of any age, as your cat encounters thousands of bacteria every day. Most of these bacteria are harmless, and your cat’s immune system will protect them from many of those that can cause disease. However, sometimes a harmful bacteria will break through your cat’s immune defenses and cause an infection.

Common sources of infection include contaminated food (particularly raw meat) or water, or contact with another infected cat.

Bacterial infections are more likely to affect cats with weakened immune systems. This includes older cats and those who already have other illnesses, particularly feline leukaemia virus (FeLV) or feline immunodeficiency virus (FIV). These cats are less able to fight off infection, and so more vulnerable to becoming ill.

What Are The Types Of Bacterial Infections In Cats?

Diagnosis of toxoplasmosis in cats

If you suspect that your cat may have toxoplasmosis, your veterinarian can help you with a diagnosis.

Some of the common types of bacteria that can cause illness in cats include:

However, not all strains of these bacteria always cause disease in healthy adult cats.

How Do You Diagnose Bacterial Infections In Cats?

Some cats with bacterial infections may need to take oral antibiotics to combat the infection.

If you suspect your cat might have an infection, it is important to take them to see your veterinarian. Sometimes, your veterinarian may suspect a bacterial infection from their physical examination or history.

However, a bacterial infection generally cannot be confirmed without taking a sample and examining it under the microscope where the bacteria themselves can be seen. Your veterinarian may take a swab of the skin or ear, a sample of joint fluid from a suspected infected joint, or a sample of the feces if your cat is showing signs of a gastrointestinal infection.

To work out the type of bacteria present, and the right type of antibiotic to treat it, this sample will need to be sent to a laboratory for culture and sensitivity testing. This is where the sample is kept in conditions that enable the bacteria to grow and the type be identified, and different antibiotics are tried to see if they are effective at killing the bacteria.

How Do You Treat Bacterial Infections In Cats?

toxoplasmosis and cats feature

Infections with pathogenic (harmful) bacteria are treated with antibacterial treatments. Many infections will require treatment with antibiotics, usually tablets. However, local infections, such as skin, ear, or eye infections, may be treated with topical treatments, such as antibiotic or antibacterial ointments that are applied only to the affected area.

Over the last few years, we are seeing that bacteria are becoming more resistant to antibiotics, meaning that some types of infections are becoming difficult to treat. Antibiotic resistance is very dangerous for humans and animals, and therefore it is vital that antibiotics are only used when absolutely necessary, and that we use the right antibiotics when we do use them.

If your cat is prescribed antibiotics, make sure you use them exactly as your veterinarian has described and ensure you attend follow-up appointments. This will help reduce the development of antibiotic resistance which is vital for future cat health.

Remember, viral infections cannot be treated with antibiotics.

How Do Cats Recover From Bacterial Infections?

Cat with possible herpesvirus causing conjunctivitis

How well cats recover from bacterial infections depends on their immune system, the type of bacteria, the area of the body that is infected, and whether the bacteria are resistant to the type of treatment used.

The good news is most simple and common infections in healthy adult cats are currently easily treated with antibacterial treatments.

Frequently Asked Questions

How would a cat get a bacterial infection?

Like humans, cats encounter thousands of bacteria every day. Most of these are harmless (and many are even beneficial), and your cat’s immune system will protect them from infection.

However, if your cat encounters a pathogenic bacterium (one that can cause disease) and their immune system is not able to fight it off, they may develop a bacterial infection. Common sources of bacterial infection include contaminated food and water, or being in contact with another animal that has a contagious bacterial infection.

How do I know if my cat has a bacterial infection?

The signs of a bacterial infection in cats vary hugely. It depends on the type of bacteria and where the infection is. However, cats with infections will often show vague symptoms such as a fever, being lethargic or off-color, and reduced appetite, and may lose weight.

If you think your cat is showing signs of an infection it is important that you take them to see your veterinarian as soon as possible, as untreated infections can become very serious.

How long does a bacterial infection last in cats?

How long a bacterial infection lasts in cats depends on the type of infection, how well your cat’s immune system is working, and whether they are receiving appropriate treatment.

Many simple and common infections in healthy cats will resolve within around a week of appropriate treatment, but severe cases or infections that are resistant to antibiotics can take weeks to months to resolve.

Are bacterial infections in cats contagious to humans?

Some bacterial infections in cats can be contagious to humans. These are called “zoonotic,” meaning that disease can be passed from animals to humans.

Bartonella henselae is an example of a zoonotic bacterial infection. It is spread to cats by parasites such as fleas or ticks. It generally only causes mild signs of illness in cats. If a cat infected with Bartonella henselae licks, bites, or scratches a person, it can cause cat scratch fever (also called cat scratch disease or Bartonellosis) in that person.

Therefore it is important to always practice good hygiene when handling cats (and particularly the litter box) and to treat any bites or scratches appropriately. If you are worried you may have caught an infection from your cat you should speak to your doctor.

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About Dr. Nat Scroggie MRCVS

Nat is a keen runner and has a passion for wellbeing, both within and outside the veterinary profession where she works hard to support others in their own wellbeing. She lives in Nottingham with her partner, their young baby and their beloved 14 year old lab x collie, Milly.

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