Cat scratch disease is a bacterial infection that can happen after a cat bites or scratches you. It is caused by a bacterium called Bartonella henselae, which lives in cat saliva. For most healthy Canadians, the illness is mild and clears up on its own. However, people with weakened immune systems need to be especially careful. This article explains what cat scratch disease is, what symptoms to watch for, and how to treat and prevent it.
What Is Cat Scratch Disease?
Cat scratch disease is triggered by the bacterium Bartonella henselae. Cats pick up this bacterium from flea bites. The fleas act as carriers, passing the bacteria to cats without making the cats sick themselves.
Once a cat carries the bacteria, it can pass it on to people. This usually happens through a scratch or bite. The bacteria live in the cat’s saliva, and cats spread it to their paws when they groom themselves. A scratch from an infected paw can therefore introduce the bacteria into your skin.
You can also get the bacteria in your eyes. For example, if you pet a cat and then rub your eyes without washing your hands first, the bacteria can enter through the eye’s surface.
Who Is Most at Risk?
Cat scratch disease is generally mild for healthy people with a strong immune system. Most people recover fully without any complications. However, the infection can become serious for those whose immune systems are weakened.
People at higher risk include:
Those undergoing chemotherapy for cancer
People living with diabetes
Those living with HIV/AIDS
Anyone taking immunosuppressant medications
If you or someone in your household falls into one of these groups, it is especially important to take precautions around cats. Talk to your family doctor about the risks specific to your situation.
Symptoms of Cat Scratch Disease
Symptoms of cat scratch disease usually appear within three to ten days of the scratch or bite. Knowing what to look for helps you act quickly and get the right care.
Early Symptoms
The first sign is usually a small bump, blister, or sore at the site of the scratch or bite. This sore can take a long time to heal, sometimes several weeks. The area around it may look red and feel warm to the touch.
Shortly after, you may notice swollen and tender lymph nodes near the injury. For example, if a cat scratches your arm, the lymph nodes in your armpit may become swollen, painful, and sore. This swelling is one of the most common signs of cat scratch disease.
Other Symptoms to Watch For
In addition to swollen lymph nodes, some people develop a low-grade fever of around 38°C (100.4°F). You might also feel unusually tired or run down. These symptoms are easy to overlook, but they are worth noting if you have recently been scratched or bitten by a cat.
In rarer cases, people experience bone or joint pain, stomach pain, or prolonged fatigue lasting more than two to three weeks. These symptoms suggest the infection may have spread and need prompt medical attention.
When to See a Doctor
Not every cat scratch needs a doctor visit. However, you should contact your family doctor or a walk-in clinic if you notice any of the following:
The wound from the scratch or bite does not heal after several days
A red area develops around the scratch and keeps getting worse, even two days after the injury
You develop a fever that lasts more than a couple of days after being scratched or bitten
Your lymph nodes stay swollen and painful for more than two to three weeks
You experience bone or joint pain, stomach pain, or extreme fatigue lasting more than two to three weeks
If you cannot reach your family doctor quickly, a walk-in clinic is a good option. Most provincial health plans in Canada cover visits to walk-in clinics for issues like this. Do not wait too long, especially if your immune system is weakened. For more information on when to seek care, visit Health Canada’s official health resources.
How Is Cat Scratch Disease Diagnosed?
Your doctor will start by asking whether you have been scratched or bitten by a cat recently. This is often the most important clue. They will then do a physical exam to check your lymph nodes and the wound site.
If your lymph nodes are swollen and your symptoms match those of cat scratch disease, your doctor may order a blood test. This special blood test checks for antibodies to Bartonella henselae. A positive result confirms the diagnosis. According to the Mayo Clinic’s overview of cat scratch disease, most cases are straightforward to diagnose based on symptoms and exposure history.
Treatment Options for Cat Scratch Disease
The good news is that cat scratch disease clears up on its own for most people. You do not always need prescription medication. Rest and simple home care are usually enough.
Home Care
Over-the-counter pain relievers like ibuprofen or acetaminophen can help ease discomfort and reduce fever. Applying a warm compress to swollen lymph nodes can also provide relief. Make sure to follow the dosage instructions on the package, and consult your pharmacist if you are unsure.
Keep the wound clean and covered to prevent further infection. Wash it gently with soap and water every day until it heals.
When Antibiotics Are Needed
In some cases, your doctor may prescribe antibiotics. This is more likely if your lymph nodes remain swollen and painful for two to three months or longer. Antibiotics may also be recommended if you have a prolonged fever or if the infection has spread to your bones, liver, or another organ.
For people with weakened immune systems, antibiotics are often prescribed earlier to prevent complications. Your doctor will choose the right antibiotic and dosage based on your health history.
Draining Swollen Lymph Nodes
In rare cases, a lymph node becomes very large or extremely painful. If this happens, your doctor may drain the fluid from it using a fine needle. This procedure provides relief and helps the node heal faster. It is a minor procedure and is usually done in a clinic setting.
How to Prevent Cat Scratch Disease
Prevention is straightforward with a few simple habits. You do not have to give up your cat to stay safe. According to Healthline’s guide on cat scratch disease prevention, most infections are preventable with good hygiene and responsible pet care.
Safe Behaviour Around Cats
Avoid teasing or provoking your cat. Most bites and scratches happen when a cat feels threatened or overstimulated. Let your cat set the pace for interaction, and teach children to do the same.
Wash your hands with soap and water after petting any cat, especially before touching your face or eyes. This simple step removes bacteria from your skin before it can cause infection.
Flea Control Is Key
Keeping your cat free of fleas is one of the most effective ways to prevent cat scratch disease. Fleas are how cats pick up Bartonella henselae in the first place. Talk to your veterinarian about a safe and effective flea prevention programme for your pet.
Young cats and kittens are more likely to carry the bacteria than older cats. Households with multiple cats also carry a higher risk of infection. If your kittens have fleas, the risk of spreading the bacteria to people in your home increases significantly.
Do Cats Need Treatment?
In most cases, cats do not need treatment. The bacteria does not make them sick. They are simply carriers. However, if you are concerned about your cat’s health or behaviour, speak with your veterinarian. They can assess your cat and advise you on any necessary steps.
Frequently Asked Questions About Cat Scratch Disease
Is cat scratch disease contagious between people?
No, cat scratch disease does not spread from person to person. It only spreads through direct contact with an infected cat, usually through a scratch or bite. You cannot catch it by being near someone who has it.
How long does cat scratch disease last?
For most healthy people, cat scratch disease resolves within two to four months without any treatment. Swollen lymph nodes may take a few weeks to return to normal. In people with weakened immune systems, the illness can last longer and may require antibiotics.
Can you get cat scratch disease from an indoor cat?
Yes, it is possible. Even indoor cats can carry Bartonella henselae if they have been exposed to fleas. However, the risk is lower for strictly indoor cats with no flea exposure. Keeping your cat on a regular flea prevention programme reduces the risk significantly.
Do I need to go to the emergency room for a cat scratch?
Most cat scratches do not require emergency care. You should visit a walk-in clinic or your family doctor if the wound does not heal, becomes increasingly red, or is accompanied by fever or swollen lymph nodes. However, if you have a severely weakened immune system and develop signs of infection, seek care promptly.
What does cat scratch disease look like on the skin?
The first sign of cat scratch disease is usually a small red bump, blister, or sore at the site of the scratch or bite. The area may appear red and slightly swollen. This sore can persist for several weeks before it fully heals.
Is cat scratch disease common in Canada?
Cat scratch disease occurs throughout Canada, as it does in most countries where domestic cats are kept as pets. Cases are more common in households with young cats or kittens, especially those with flea infestations. Most cases go unreported because symptoms are mild and resolve without medical treatment.
Key Takeaways
Cat scratch disease is caused by the bacterium Bartonella henselae, spread through cat bites or scratches.
Most healthy people recover on their own without treatment.
Swollen lymph nodes, a sore at the wound site, and mild fever are the most common symptoms.
People with weakened immune systems face a higher risk of serious complications.
Contact your family doctor or a walk-in clinic if symptoms persist or worsen.
Prevent infection by washing your hands after handling cats, avoiding rough play, and keeping cats free of fleas.
Cats rarely need treatment, but speak to your veterinarian if you have concerns.
This article is for general information purposes only. Always consult your family doctor or a qualified healthcare provider before making any decisions about your health or treatment.
