Is Your Cat’s Slobber Hazardous to Your Health?

Cat drool, also known as cat saliva, is a liquid secretion produced in the mouths of cats. It contains a variety of components including electrolytes, enzymes, immunoglobulins, and other substances. The main purpose of cat drool is to aid in lubrication for eating and grooming. However, cat saliva also contains bacteria that can potentially be harmful to humans.

Cat saliva contains enzymes like lysozymes, peroxidases, and amylases that help cats digest their food. It also contains electrolytes like calcium, magnesium, and phosphate that aid in lubrication. Additionally, cat drool contains unique proteins, immunoglobulins, and antimicrobial compounds that help protect cats from infections.

While cat drool plays an important role in feline health and physiology, some of the bacteria found in cat saliva can be a risk to humans. Cat bite infections are not uncommon and carry risks of developing complications. Understanding the potential health implications of exposure to cat saliva will be covered throughout this article.

Potential Health Risks

a cat licking its mouth and drooling

Cat saliva can contain several types of harmful microbes that are transmissible to humans, including bacteria, viruses, and parasites. Some of the main health risks associated with cat saliva exposure include:

Bacterial infections: Cat saliva may contain bacteria such as Bartonella henselae, which can lead to cat scratch disease (CSD). CSD often causes swollen lymph nodes and fever after a cat scratch or bite. Cat saliva also contains Pasteurella multocida, which can cause painful wound infections (1).

Viral infections: Cats can transmit viruses like rabies through bites and saliva exposure. Rabies is rare in housecats but can be fatal if untreated. Cats may also carry feline immunodeficiency virus (FIV) and feline leukemia virus (FeLV) in saliva, but human transmission is very rare (2).

Parasitic infections: Parasites like Toxoplasma gondii can shed in cat feces and contaminate saliva. Toxoplasmosis infection can cause flu-like symptoms and brain/eye damage in humans (3).

Overall, healthy adults are at low risk for serious illness from cat saliva. However, bites or scratches can cause infections, and some pathogens may pose higher risks for pregnant women, infants, and immunocompromised individuals. Practicing good hygiene and wound care helps reduce risks.

Bacterial Infections

Cat saliva commonly contains bacteria like Pasteurella multocida and Bartonella henselae, which can cause serious infections when transmitted to humans through bites or scratches ( P. multocida bacteria can lead to painful swelling, abscesses, and joint infections in humans, while B. henselae is responsible for cat scratch disease, which causes fever, headache, and lymph node swelling (

a person's injured hand after a cat bite

These bacteria are also highly toxic to birds and other small animals due to their weaker immune systems. Even a small scratch or bite from a cat can lead to potentially fatal infections in birds and small mammals. Prompt treatment with antibiotics is often necessary to prevent serious illness or death in humans and animals exposed to bacteria from cat saliva.

Viral Infections

Cats can transmit certain viral infections to humans through bites and scratches. Some of the main viral infections associated with cat saliva include:

  • Bartonella – Also known as cat scratch disease, Bartonella is a bacterial infection transmitted through cat scratches. Symptoms include swollen lymph nodes, fever, and fatigue. It can lead to more serious complications if untreated.a communications guide for – health & wellbeing
  • Rabies – A rare but serious viral infection in cats that can be transmitted through bites and scratches. Rabies attacks the central nervous system and is fatal if left untreated.
  • Herpes B Virus – Primarily found in monkeys, herpes B can sometimes occur in cats and be passed to humans, leading to severe neurological disease.

To reduce the risk of viral transmission, properly clean any cat bites or scratches. Seek medical attention for symptoms like fever, muscle aches, or lymph node swelling after a cat injury.

Parasitic Infections

microscopic image of parasites

Cats can carry certain parasitic infections that may be transmitted to humans through contact with saliva. One study found a high prevalence of endoparasites, including hookworms and tapeworms, in household cats. One of the most concerning parasitic infections cats may transmit is toxoplasmosis.

Toxoplasmosis is caused by the parasite Toxoplasma gondii. Cats are the definitive host for T. gondii, meaning the parasite reproduces sexually in the cat’s intestines. The parasites are then shed in the cat’s feces. Humans can become infected through ingesting contaminated soil, water or food, or through direct contact with cat feces. For most healthy adults, toxoplasmosis causes no symptoms. However, the infection can cause serious complications in immunosuppressed individuals and pregnant women, potentially leading to birth defects or miscarriage if a woman is newly infected during pregnancy.

Hookworms are intestinal parasites that cats may ingest by swallowing infective larvae. The hookworm eggs are shed in the cat’s feces. Humans can become infected through direct contact with contaminated soil or feces. Hookworm larvae can penetrate the skin and migrate through the body, causing a condition called cutaneous larva migrans characterized by severe itching and a winding rash. Hookworms can also be accidentally ingested through contaminated food or water, leading to gastrointestinal symptoms.

While concerning, parasitic infections from cats can be prevented through proper hygiene, frequent veterinary care and deworming of cats, and prompt treatment if exposure is suspected.

Allergic Reactions

Cat saliva contains allergenic proteins that can cause allergic reactions in humans. The most common symptoms of cat saliva allergy include:

someone sneezing due to cat allergies

  • Sneezing
  • Itchy, watery eyes
  • Runny nose
  • Nasal congestion
  • Coughing
  • Facial swelling
  • Hives or skin rash

According to one source, “Even if it’s a cat saliva allergy, they get it in their fur and skin (dander), so you’re still allergic to the whole situation” (source). The allergenic proteins can be transferred from a cat’s saliva onto its fur when grooming. When a person touches or inhales the dander, an allergic reaction may occur.

The symptoms can range from mild to severe depending on the individual. In rare cases, a severe allergic reaction called anaphylaxis may occur, causing throat swelling, difficulty breathing, low blood pressure, and other dangerous symptoms.

Precautions for Humans

There are some simple precautions that humans can take to reduce any potential risks from cat saliva and drool:

Wash Hands

Washing hands frequently can help reduce transmission of bacteria, viruses, and parasites that may be present in cat saliva. Wash hands after petting or handling cats, cleaning up drool, or cleaning litter boxes.

Avoid Scratches and Bites

Try to avoid situations where a cat may scratch or bite, which could allow saliva to enter the wound. Properly trimming cats’ nails can reduce scratching behavior.

Practice Good Hygiene

Keeping cats’ food bowls, toys, bedding clean can help reduce bacterial growth. Cleaning litter boxes daily and washing hands afterwards is also important. Keeping cats up-to-date on vaccines and parasite prevention can reduce shedding of germs.

While cat drool may carry some risks, taking proper precautions can greatly reduce the chances of developing any illnesses from exposure. Overall the risk to healthy humans is low.

Testing and Treatment

Cat saliva can transmit bacterial, viral, and parasitic infections to humans. Diagnosing infections passed from cats requires medical testing.

Cat scratch disease, caused by the Bartonella henselae bacteria, is one of the most common infections spread through cat saliva. Doctors can diagnose it by checking for swollen lymph nodes near the scratch or bite and running blood tests. Antibiotics like azithromycin or doxycycline usually treat cat scratch disease (Gomes-Keller, 2006).

Cats may also pass the virus that causes cat scratch fever. Doctors diagnose this by testing for antibodies or running PCR tests on fluid from sores. They can prescribe antiviral medications to treat it (Babyak et al., 1996).

To check for parasitic infections like toxoplasmosis, doctors may order blood tests, PCR tests, or microscopic examination of fluid samples. Medications like pyrimethamine and sulfadiazine can treat parasites from cat saliva (Johns Hopkins Medicine).

Risks for Specific Populations

Certain groups of people may be at higher risk for getting sick from diseases that can be transmitted through cat saliva, bites, or scratches, including:

Young children – Their immune systems are still developing, so they are more susceptible to infections. Children are also more likely to have close contact with pets and may not wash hands frequently.

Pregnant women – Pregnancy weakens the immune system, so pregnant women have a higher risk of getting sick from toxoplasmosis, which is transmitted through cat feces (CDC). It can cause birth defects and miscarriage.

Immunocompromised individuals – Those with weakened immune systems due to HIV/AIDS, chemotherapy, chronic conditions, medications, or age have a higher risk of infection. Diseases that wouldn’t normally affect healthy adults can become serious in immunocompromised people.

Elderly adults – Weakened immune systems in the elderly put them at increased risk. They are also more prone to falls that can cause bites and scratches when handling cats.


In summary, while cat drool itself is not inherently dangerous, it can potentially transmit infectious diseases and cause allergic reactions in some people. The main health risks come from bacteria, viruses, and parasites that cats may harbor. People with weaker immune systems, such as the elderly, children, or those with chronic illnesses are at higher risk of infection.

To reduce risk, it’s recommended that cat owners practice good hygiene, wash hands after interacting with pets, and avoid being licked on the mouth or nose. Any bites or scratches should be cleaned and monitored for signs of infection. People concerned about allergies can get tested and avoid extended exposure to drool if sensitive. Children should be supervised when playing with pets.

While cat drool can pose some risks in rare cases, cats make wonderful pets for most people. By understanding the potential health hazards and taking simple precautions, cat owners can fully enjoy their feline friends.

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