Does Your Cat’s Lick Contain Hidden Dangers?


Cat saliva does contain bacteria and germs that can pose health risks to humans in some situations. This article explores the types of germs found in cat saliva, potential disease risks from cat bites and scratches, allergic reactions, and precautions to take. The goal is to provide cat owners and people interacting with cats complete information on the risks, how to clean cat saliva from skin and wounds, and steps to protect health when around felines.

Types of Bacteria

Cat saliva contains a mixture of different bacteria, but the main ones found are Pasteurella, Streptococcus, Bartonella, and Neisseria. Pasteurella is the most common, present in over 50% of healthy cats. These bacteria are normal inhabitants of a cat’s oral microbiome and are not harmful to the cat itself (Reddit, 2022).

However, Pasteurella can cause serious infections if introduced into bite wounds or punctures of human skin. Streptococcus and Bartonella bacteria can also sometimes cause infections in humans if transmitted by a bite. Neisseria is less likely to cause problems but may infect bites in some cases.

While many bacteria live naturally in a cat’s mouth without issue, they can pose a risk to humans through bites or scratches that expose us to higher levels of these microbes (Reddit, 2022).

Disease Risks

Cat saliva can potentially transmit diseases to humans, especially through bites and scratches. Some diseases that may be transmitted through cat saliva include:

  • Bartonellosis (Cat Scratch Disease) – Caused by the Bartonella henselae bacteria, this disease often leads to swollen lymph nodes and fever after a cat bite or scratch. It is estimated that around 40% of cats carry this bacteria in their saliva. (
  • Pasteurellosis – Caused by the Pasteurella multocida bacteria, this disease causes painful wound infections after cat bites and scratches. Studies show over 50% of cat mouths contain this bacteria.
  • Capnocytophaga – This bacteria can lead to severe infections, especially in immunocompromised individuals. Symptoms include fever, vomiting, and muscle pain after a cat bite.
  • Rabies – While not as common as other diseases, rabies can be transmitted through infected cat saliva via bites. Once symptoms appear, rabies is almost always fatal.

Kittens and outdoor cats tend to have higher rates of pathogenic bacteria in their mouths than indoor adult cats. Still, any cat bite should be monitored closely for signs of infection.

Bite Infections

Cat bites have a higher risk of infection compared to dog bites. According to a study cited on, while only 3-18% of dog bites become infected, 28-80% of cat bites result in an infection. The bacteria in a cat’s mouth, especially Pasteurella multocida, are often the culprit behind these infections.

Cat bites that puncture deeper into the skin and tissue have an increased infection risk since the bacteria can be sealed inside. Bites to the hand are especially problematic due to all the small muscles, tendons, joints, and ligaments that can be affected if bacteria spreads. Infections from cat bites may cause intense inflammation, pain, redness, swelling, and joint immobility if not treated promptly with antibiotics.


Some people are allergic to proteins found in cat saliva, dander and urine. An allergic reaction happens when the immune system overreacts to harmless substances called allergens. When someone with a cat allergy comes into contact with cat saliva, their immune system mistakenly believes the proteins are harmful and releases antibodies and chemicals like histamine to attack them. This causes allergy symptoms like itchy, watery eyes, sneezing, coughing, runny nose, skin irritation and asthma.

The major cat allergen is a protein called Fel d 1, which is found primarily in cat saliva. When a cat cleans and grooms themselves, the saliva dries on their fur and skin. The allergen particles then become airborne and can be breathed in. Allergens can also spread by getting onto surfaces like furniture and clothing. People with cat allergies react when the particles enter the eyes, nose or throat and cause an immune reaction.

Those with severe cat allergies may experience potentially dangerous respiratory symptoms like wheezing, chest tightness and shortness of breath if exposed. In rare cases, a life-threatening allergic reaction called anaphylaxis is possible. This requires immediate medical attention. It’s important for people with significant cat allergies to avoid contact with cat saliva and dander as much as possible to prevent a reaction.

Kittens vs Adults

There is a clear difference in bacteria levels between kittens and adult cats. Research shows that kittens have much higher levels of bacteria in their saliva compared to adult cats.

One study analyzed the oral microbiome development in kittens from 4 weeks to 1 year of age. It found that bacterial diversity increased rapidly from 4 to 8 weeks of age as kittens transitioned from nursing to solid food. Streptococcus, Staphylococcus, Moraxella, and Pasteurella were the predominant genera in 4-week-old kittens, indicating high levels of bacteria. As kittens matured, bacterial diversity continued increasing and their saliva microbiome began resembling that of adult cats (Spears, 2018).

Another study by the CDC found higher rates of Bartonella infection among kittens compared to adult cats. Kittens showing evidence of Bartonella infection were more likely to have a high bacterial load in their saliva (CDC, 2022).

Therefore, kittens tend to have less diverse oral microbiomes and higher levels of potentially harmful bacteria in their saliva compared to adult cats. As kittens mature, their immune systems develop and their saliva microbiome becomes more balanced.

Cleaning Saliva

While cat saliva does contain bacteria, prompt cleaning of any skin exposed to cat saliva can help prevent infections. If a cat licks your skin or you get bitten or scratched, wash the area with warm soapy water as soon as possible. An antibacterial soap or wound wash is ideal for cleaning any bite sites or scratches.

For small scratches or wounds, apply an antibiotic ointment after cleaning, and cover with a sterile bandage. Watch for any signs of infection like redness, swelling, oozing, or fever and see a doctor if these develop.

Deep puncture wounds from cat bites should be promptly cleaned with warm soapy water, and seen by a medical professional. Puncture wounds have an increased risk of infection and may need antibiotic treatment. Thoroughly flush cat saliva from any open wounds with clean water or saline solution.

Apply antibiotic ointments sparingly after cleaning as they can trap bacteria inside deep wounds. Cover significant bite wounds with sterile gauze or a bandage, and change the dressing frequently. Avoid rebandaging a wound that is healing unless medically needed. See a doctor for any bite wounds that show signs of infection.

For wounds on the face or near joints, urgent medical care is advised as infections can spread quickly to bone in these areas. While cleaning saliva from the skin promptly can help prevent problems, seek medical attention for bite wounds, especially deep punctures or those showing any signs of infection.


When interacting with cats, it’s important to take some basic precautions to reduce your risk of getting sick from germs in their saliva. According to the CDC, you should always wash your hands with soap and water after handling cats, litter boxes, or cat food 1. You can use an alcohol-based hand sanitizer if soap and water are not available. The CDC also recommends wearing gloves when gardening or cleaning the litter box, since cats can transmit germs through feces 1.

If you are immunocompromised or prone to allergies, take extra care when interacting with cats. Try to avoid being licked on the face and wash any scratched skin right away, since cat saliva can cause infections. Keep cats out of your bedroom if possible to reduce nighttime allergy symptoms 2. With some simple precautions, you can safely enjoy time with cats while minimizing disease risks.

Risk Factors

Certain groups of people are at higher risk for contracting illnesses from cat saliva. According to the CDC, people with compromised immune systems due to medications, chronic illness, or age are more susceptible to bacterial infections from cat and dog bites or scratches. People with spleen dysfunction or who have had their spleen removed are also at increased risk. Additionally, alcoholics and those with liver disease or iron overload disease have a harder time fighting Capnocytophaga infections.

Young children, older adults, and pregnant women also tend to be more vulnerable to illnesses caused by cat saliva bacteria. Their immune systems may not be as strong to fend off infection. For people in higher risk groups, caution should be taken when interacting with cats to avoid bites and scratches that could lead to illness.


Does cat saliva contain germs? As we’ve explored, the answer is yes – cat saliva harbors many types of bacteria that can pose health risks. Kittens tend to have more germs and infections in their mouths than adult cats. Diseases like cat scratch fever and plague can be transmitted through bites and scratches. Bacteria like Pasteurella and Capnocytophaga are common and can cause serious infections. Allergies are also a concern, especially for people sensitive to the Fel d 1 protein in cat saliva. While risks do exist, proper precautions like handwashing, wound care, and avoiding bites/scratches can minimize the chance of illness. Overall, cat saliva should be handled carefully as it does contain potentially harmful germs. But with responsible cat ownership, the health risks can be managed.

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