If a cat just bit you, start by washing the wound under running water with soap for at least five minutes. Cat bites are more dangerous than they look. Between 20% and 80% of cat bites become infected, a rate far higher than dog bites, because cats’ thin, needle-like teeth push bacteria deep into tissue where it’s hard to clean out.
Immediate First Aid Steps
If the bite is bleeding, press a clean cloth or bandage against it until the bleeding stops. Then hold the wound under a faucet and wash it with soap and water for at least five minutes. Use the pressure of the running water to flush out bacteria, but don’t scrub the wound itself, as that can bruise the tissue and make things worse. After washing, apply an antiseptic cream and cover it with a clean bandage.
This applies whether the bite is a shallow scrape or a deeper puncture. Puncture wounds are especially tricky because they can look minor on the surface while driving bacteria deep below the skin. Even if the bite barely bled, wash it thoroughly.
Why Cat Bites Get Infected So Often
Cat teeth are sharp and slender, almost like needles. When they puncture your skin, they create a small, deep wound that quickly closes over at the surface, trapping bacteria in a pocket underneath. That warm, sealed environment is ideal for bacterial growth.
The most common bacterium found in infected cat bites is one that lives naturally in cats’ mouths. It thrives in the low-oxygen conditions created by a deep puncture wound and can cause redness, swelling, and pus within hours. Several other bacterial species in cat saliva can also contribute to infection, which is why doctors sometimes see mixed infections from a single bite.
Hand and Wrist Bites Are Especially Serious
Roughly 45% to 65% of animal bites land on the hands and wrists, often during petting or feeding. This is the worst place to get bitten. Your hand has tendons, joints, blood vessels, and nerves sitting just below a thin layer of soft tissue, with very little cushion between the skin surface and those critical structures. A cat’s narrow teeth can easily reach bone, joint spaces, or tendon sheaths, and once bacteria get into those areas, infection can spread rapidly.
Hand infections from cat bites can progress to spreading redness, red streaks traveling up the arm, and severe swelling in a matter of hours. In serious cases, surgical cleaning of the wound is needed to prevent permanent damage. If a cat bites your hand, fingers, or wrist, getting medical attention quickly is more important than with bites to fleshier areas like the upper arm or thigh.
Signs of Infection to Watch For
Infection from a cat bite can develop fast, sometimes within 12 to 24 hours. Watch the wound closely during the first few days and look for:
- Increasing redness that spreads outward from the bite
- Swelling or warmth around the wound
- Pain that gets worse instead of better
- Pus or drainage from the bite site
- Red streaks extending away from the wound toward your body
- Fever, headache, or flu-like symptoms
- Swollen lymph nodes near the bite
Any of these signs means you need medical care promptly. Don’t wait to see if it improves on its own. Cat bite infections can escalate quickly, and early treatment makes a significant difference in outcomes.
When You Need a Doctor Right Away
Some cat bites warrant a medical visit even before signs of infection appear. Seek care if the bite is deep or punctured the skin cleanly (even if it looks small), if it’s on your hand, fingers, wrist, face, or near a joint, or if you can’t stop the bleeding. Bites from stray, feral, or unvaccinated cats also need prompt attention because of the added risk of rabies and because you can’t verify the animal’s health.
People with weakened immune systems, diabetes, liver disease, or anyone taking medications that suppress the immune system should treat any cat bite as a reason to call a doctor. These conditions reduce your body’s ability to fight off the bacteria that cat bites introduce.
What Happens at the Doctor’s Office
Your doctor will clean and examine the wound, often irrigating it more aggressively than you can at home. For most cat bites that have broken the skin, preventive antibiotics are standard. The typical course runs three to five days. If an infection has already set in, you may need a longer course or, in severe cases involving the hand, a procedure to clean out infected tissue.
Your tetanus status matters too. If you haven’t had a tetanus booster in the past five years and the wound is deep or dirty, you’ll likely need one. If you can’t remember when your last shot was, mention that to your doctor.
Rabies: When It’s a Concern
Rabies from a cat bite is rare in the United States, but it’s fatal once symptoms appear, so it’s taken seriously. If the cat is a healthy, vaccinated household pet, rabies is very unlikely. The standard protocol is to observe the cat for 10 days. If the cat remains healthy during that window, rabies can be ruled out.
The situation changes if the cat is a stray, if it was acting strangely, if it bit multiple people or animals, or if it dies or disappears after the bite. In those cases, rabies post-exposure treatment should begin immediately rather than waiting to observe the animal. This treatment is highly effective when started promptly.
Cat Scratch Disease
Cat scratch disease is a separate infection caused by a different bacterium that cats carry, especially kittens. It can be transmitted through bites as well as scratches. Symptoms are distinct from a typical wound infection: you may develop a small blister or pimple at the bite site, followed by swollen, tender lymph nodes one to three weeks later, along with a low-grade fever.
Most cases resolve on their own, though it can take weeks to months for the lymph node swelling to go down. In rare cases, the infection can spread to the eyes, liver, spleen, or other organs. Children and people with weakened immune systems are more vulnerable to these complications. If you develop swollen glands near a cat bite that wasn’t there before, especially a few weeks after the bite, that pattern points toward cat scratch disease rather than a standard wound infection.