Cat Scratch Disease

Cat scratch disease is an infection by Bartonella henselae bacteria. It causes swollen glands, usually after a scratch or a bite from a cat.

Where Is Bartonella henselae Found?

Bartonella henselae, the bacterium that causes cat scratch disease, is found all over the world. Cats and kittens carry the bacterium in their saliva. Although the infection does not make cats or kittens sick, they can transmit the infection to people, most often through a bite or a scratch. People cannot pass along the infection to other people.

What Happens When People Get Cat Scratch Disease?

Symptoms

Cat scratch disease usually results in a sore appearing at the site of the bite or scratch a few days afterward, followed a week or two later by swelling of the lymph nodes^* (swollen glands) near the bite or the scratch as the body's immune system fights off the infection. Adults will sometimes run a low fever, or have a headache and joint pain, or feel more tired than usual. Most people get better within about three weeks. People with weakened immune systems are at risk for more serious complications, which may include:

• retinitis (re-ti-NY-tis): inflammation of the retina of the eye, which can cause blindness
• encephalitis (en-sef-a-LY-tis): inflammation of the brain
• seizures
• infections of the liver, spleen, bones, or other organs.

Diagnosis

The doctor usually starts with a physical exam and a medical history, which should include information about contact with cats. The doctor may diagnose cat scratch disease if the person has fever, is feeling unwell, and has enlarged lymph nodes accompanied by a blister. Other ways to identify the disease include testing the blood for antibodies to Bartonella or performing a biopsy on an enlarged lymph node.

Treatment

Most people get better on their own. The doctor may prescribe antibiotics to help fight the bacterial infection, and the doctor may drain fluid from lymph nodes that are severely enlarged. People with weakened immune systems need continuing care from their doctors to minimize the risk of complications.

Preventing Cat Scratch Disease

It is important to teach children to stay away from stray cats and unknown cats. It is also important to teach them to be careful with their own pets, who may bite and scratch when provoked. Whenever cats bite or scratch people, it is a good idea to check with a doctor (about the person) and with a veterinarian (about the pet).

User Contributions:

The following comments are not guaranteed to be that of a trained medical professional. Please consult your physician for advice.

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